Make CPDF_Page retainable.

Small step to reducing the differences between XFA and non-XFA. We
still use the RetainPtr pretty much as if it were an unique_ptr, in
that we're not yet caching pages and handing out multiple pointers
to the same page in the non-XFA case.

The one change is in page view cleanup, where we no longer need a
boolean and can take (sufficient) page ownership with a RetainPtr.

Tidy up some document.h -> page.h -> document.h circular inclusion
while we're at it.

NOTE: Wait for imminent branch to pass before landing. We'll want
this to bake a while.

Change-Id: I64a2f12ac3424ece1063d40583995b834117cf34
Reviewed-on: https://pdfium-review.googlesource.com/32790
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/fpdfsdk/fpdf_editpage.cpp b/fpdfsdk/fpdf_editpage.cpp
index ea4659f54a..39cf85fb95 100644
--- a/fpdfsdk/fpdf_editpage.cpp
+++ b/fpdfsdk/fpdf_editpage.cpp
@@ -196,9 +196,9 @@ FPDF_EXPORT FPDF_PAGE FPDF_CALLCONV FPDFPage_New(FPDF_DOCUMENT document,
   // Eventually, fallthru into non-XFA case once page type is consistent.
   return nullptr;
 #else  // PDF_ENABLE_XFA
-  auto pPage = pdfium::MakeUnique<CPDF_Page>(pDoc, pPageDict, true);
+  auto pPage = pdfium::MakeRetain<CPDF_Page>(pDoc, pPageDict, true);
   pPage->ParseContent();
-  return FPDFPageFromUnderlying(pPage.release());  // Caller takes ownership.
+  return FPDFPageFromUnderlying(pPage.Leak());  // Caller takes ownership.
 #endif  // PDF_ENABLE_XFA
 }