Revert "Add a build target and a proper export header for shared library builds."

This reverts commit 00334675c18a0203f313cceb670c970a77280f49.

Reason for revert: Breaking the deps roller - https://chromium-review.googlesource.com/c/609307

Original change's description:
> Add a build target and a proper export header for shared library builds.
> 
> This CL adds support for Chromium's component build feature to pdfium.
> 
> The export header stub in fpdfview.h is expanded to match Chromium's
> export mechanisms and patterns (fixes pdfium:825).
> 
> A component/shared library build can be triggered by adding
> 
> is_component_build = true
> 
> as a gn argument. Please note that setting this will also affect some
> of pdfiums dependencies like v8, which will be build as components
> too.
> 
> Additionally, this CL provides a "pdf_source_set" template which
> dynamically enables the use of "source_set" when building a complete
> static library or a shared library to reduce build time.
> 
> When testing this it is recommended to only build the pdfium target as
> most of pdfiums test rely on non-public functions which aren't exported
> by the shared library.
> 
> Bug: pdfium:825,pdfium:826
> Change-Id: Icedc538ec535e11d1e53c4d5fabc8c064b275752
> Reviewed-on: https://pdfium-review.googlesource.com/8970
> Reviewed-by: dsinclair <dsinclair@chromium.org>
> Commit-Queue: dsinclair <dsinclair@chromium.org>

TBR=thestig@chromium.org,tsepez@chromium.org,brucedawson@chromium.org,dsinclair@google.com,dsinclair@chromium.org,licorn@gmail.com

Change-Id: Ib02af2298932481293f50d362ae87bfedf284821
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: pdfium:825, pdfium:826
Reviewed-on: https://pdfium-review.googlesource.com/10550
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

1 files changed, 9 insertions, 11 deletions

diff --git a/fpdfsdk/fpdf_structtree.cpp b/fpdfsdk/fpdf_structtree.cpp
index a6bf60d0df..bd6641f7cb 100644
--- a/fpdfsdk/fpdf_structtree.cpp
+++ b/fpdfsdk/fpdf_structtree.cpp
@@ -37,8 +37,7 @@ unsigned long WideStringToBuffer(const CFX_WideString& str,
 
 }  // namespace
 
-FPDF_EXPORT FPDF_STRUCTTREE FPDF_CALLCONV
-FPDF_StructTree_GetForPage(FPDF_PAGE page) {
+DLLEXPORT FPDF_STRUCTTREE STDCALL FPDF_StructTree_GetForPage(FPDF_PAGE page) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return nullptr;
@@ -47,18 +46,17 @@ FPDF_StructTree_GetForPage(FPDF_PAGE page) {
       .release();
 }
 
-FPDF_EXPORT void FPDF_CALLCONV
-FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) {
+DLLEXPORT void STDCALL FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) {
   std::unique_ptr<CPDF_StructTree>(ToStructTree(struct_tree));
 }
 
-FPDF_EXPORT int FPDF_CALLCONV
+DLLEXPORT int STDCALL
 FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree) {
   CPDF_StructTree* tree = ToStructTree(struct_tree);
   return tree ? tree->CountTopElements() : -1;
 }
 
-FPDF_EXPORT FPDF_STRUCTELEMENT FPDF_CALLCONV
+DLLEXPORT FPDF_STRUCTELEMENT STDCALL
 FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index) {
   CPDF_StructTree* tree = ToStructTree(struct_tree);
   if (!tree || index < 0 || index >= tree->CountTopElements())
@@ -66,7 +64,7 @@ FPDF_StructTree_GetChildAtIndex(FPDF_STRUCTTREE struct_tree, int index) {
   return tree->GetTopElement(index);
 }
 
-FPDF_EXPORT unsigned long FPDF_CALLCONV
+DLLEXPORT unsigned long STDCALL
 FPDF_StructElement_GetAltText(FPDF_STRUCTELEMENT struct_element,
                               void* buffer,
                               unsigned long buflen) {
@@ -77,7 +75,7 @@ FPDF_StructElement_GetAltText(FPDF_STRUCTELEMENT struct_element,
              : 0;
 }
 
-FPDF_EXPORT unsigned long FPDF_CALLCONV
+DLLEXPORT unsigned long STDCALL
 FPDF_StructElement_GetType(FPDF_STRUCTELEMENT struct_element,
                            void* buffer,
                            unsigned long buflen) {
@@ -86,7 +84,7 @@ FPDF_StructElement_GetType(FPDF_STRUCTELEMENT struct_element,
               : 0;
 }
 
-FPDF_EXPORT unsigned long FPDF_CALLCONV
+DLLEXPORT unsigned long STDCALL
 FPDF_StructElement_GetTitle(FPDF_STRUCTELEMENT struct_element,
                             void* buffer,
                             unsigned long buflen) {
@@ -96,13 +94,13 @@ FPDF_StructElement_GetTitle(FPDF_STRUCTELEMENT struct_element,
              : 0;
 }
 
-FPDF_EXPORT int FPDF_CALLCONV
+DLLEXPORT int STDCALL
 FPDF_StructElement_CountChildren(FPDF_STRUCTELEMENT struct_element) {
   CPDF_StructElement* elem = ToStructTreeElement(struct_element);
   return elem ? elem->CountKids() : -1;
 }
 
-FPDF_EXPORT FPDF_STRUCTELEMENT FPDF_CALLCONV
+DLLEXPORT FPDF_STRUCTELEMENT STDCALL
 FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element,
                                    int index) {
   CPDF_StructElement* elem = ToStructTreeElement(struct_element);