Remove unused author and and user stylesheets

We only load atyles from the CXFA_TextParser which loads a static UserAgent
stylesheet. This CL removes the User and Author styles from the system
and simplifies the storage of the stylesheets.

Change-Id: I7abcf39333655f8dd6bc2cfe685c8cf73b779c7d
Reviewed-on: https://pdfium-review.googlesource.com/2293
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

2 files changed, 16 insertions, 18 deletions

diff --git a/xfa/fxfa/app/cxfa_textparser.cpp b/xfa/fxfa/app/cxfa_textparser.cpp
index 703d11ec11..6386edfad8 100644
--- a/xfa/fxfa/app/cxfa_textparser.cpp
+++ b/xfa/fxfa/app/cxfa_textparser.cpp
@@ -7,6 +7,7 @@
 #include "xfa/fxfa/app/cxfa_textparser.h"
 
 #include <algorithm>
+#include <utility>
 
 #include "third_party/base/ptr_util.h"
 #include "xfa/fde/css/cfde_cssaccelerator.h"
@@ -39,12 +40,10 @@ enum class TabStopStatus {
 
 }  // namespace
 
-CXFA_TextParser::CXFA_TextParser() : m_pUASheet(nullptr), m_bParsed(false) {}
+CXFA_TextParser::CXFA_TextParser()
+    : m_bParsed(false), m_cssInitialized(false) {}
 
 CXFA_TextParser::~CXFA_TextParser() {
-  if (m_pUASheet)
-    m_pUASheet->Release();
-
   for (auto& pair : m_mapXMLNodeToParseContext) {
     if (pair.second)
       delete pair.second;
@@ -76,14 +75,16 @@ void CXFA_TextParser::InitCSSData(CXFA_TextProvider* pTextProvider) {
     m_pSelector->SetDefFontSize(fFontSize);
   }
 
-  if (!m_pUASheet) {
-    m_pUASheet = LoadDefaultSheetStyle();
-    m_pSelector->SetStyleSheet(FDE_CSSStyleSheetGroup::UserAgent, m_pUASheet);
-    m_pSelector->UpdateStyleIndex();
-  }
+  if (m_cssInitialized)
+    return;
+
+  m_cssInitialized = true;
+  auto uaSheet = LoadDefaultSheetStyle();
+  m_pSelector->SetUAStyleSheet(std::move(uaSheet));
+  m_pSelector->UpdateStyleIndex();
 }
 
-CFDE_CSSStyleSheet* CXFA_TextParser::LoadDefaultSheetStyle() {
+std::unique_ptr<CFDE_CSSStyleSheet> CXFA_TextParser::LoadDefaultSheetStyle() {
   static const FX_WCHAR s_pStyle[] =
       L"html,body,ol,p,ul{display:block}"
       L"li{display:list-item}"
@@ -95,12 +96,9 @@ CFDE_CSSStyleSheet* CXFA_TextParser::LoadDefaultSheetStyle() {
       L"sup{vertical-align:+15em;font-size:.66em}"
       L"sub{vertical-align:-15em;font-size:.66em}";
 
-  CFDE_CSSStyleSheet* pStyleSheet = new CFDE_CSSStyleSheet();
-  if (!pStyleSheet->LoadBuffer(s_pStyle, FXSYS_wcslen(s_pStyle))) {
-    pStyleSheet->Release();
-    pStyleSheet = nullptr;
-  }
-  return pStyleSheet;
+  auto sheet = pdfium::MakeUnique<CFDE_CSSStyleSheet>();
+  return sheet->LoadBuffer(s_pStyle, FXSYS_wcslen(s_pStyle)) ? std::move(sheet)
+                                                             : nullptr;
 }
 
 CFDE_CSSComputedStyle* CXFA_TextParser::CreateRootStyle(
diff --git a/xfa/fxfa/app/cxfa_textparser.h b/xfa/fxfa/app/cxfa_textparser.h
index a0b5ab1f29..7a94f83aeb 100644
--- a/xfa/fxfa/app/cxfa_textparser.h
+++ b/xfa/fxfa/app/cxfa_textparser.h
@@ -88,13 +88,13 @@ class CXFA_TextParser {
   void ParseRichText(CFDE_XMLNode* pXMLNode,
                      CFDE_CSSComputedStyle* pParentStyle);
   void ParseTagInfo(CFDE_XMLNode* pXMLNode, CXFA_CSSTagProvider& tagProvider);
-  CFDE_CSSStyleSheet* LoadDefaultSheetStyle();
+  std::unique_ptr<CFDE_CSSStyleSheet> LoadDefaultSheetStyle();
   CFDE_CSSComputedStyle* CreateStyle(CFDE_CSSComputedStyle* pParentStyle);
 
   std::unique_ptr<CFDE_CSSStyleSelector> m_pSelector;
-  CFDE_CSSStyleSheet* m_pUASheet;
   std::map<CFDE_XMLNode*, CXFA_TextParseContext*> m_mapXMLNodeToParseContext;
   bool m_bParsed;
+  bool m_cssInitialized;
 };
 
 #endif  // XFA_FXFA_APP_CXFA_TEXTPARSER_H_