Bug 676054: part3: nsStyleSheetService::GetInstance. r=bz

content/base/src/nsDocument.cpp

@@ -2340,12 +2340,6 @@ nsDocument::FillStyleSet(nsStyleSet* aStyleSet)
   NS_PRECONDITION(mStyleAttrStyleSheet, "No style attr stylesheet?");
   NS_PRECONDITION(mAttrStyleSheet, "No attr stylesheet?");
 
-  nsCOMPtr<nsIStyleSheetService> dummy =
-    do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
-
-  nsStyleSheetService *sheetService = nsStyleSheetService::gInstance;
-
-
   aStyleSet->AppendStyleSheet(nsStyleSet::ePresHintSheet, mAttrStyleSheet);
 
   aStyleSet->AppendStyleSheet(nsStyleSet::eStyleAttrSheet,
@@ -2359,6 +2353,7 @@ nsDocument::FillStyleSet(nsStyleSet* aStyleSet)
     }
   }
 
+  nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
   if (sheetService) {
     sheetService->AuthorStyleSheets()->EnumerateForwards(AppendAuthorSheet,
                                                          aStyleSet);

layout/base/nsDocumentViewer.cpp

@@ -2232,10 +2232,7 @@ DocumentViewerImpl::CreateStyleSet(nsIDocument* aDocument,
   styleSet->PrependStyleSheet(nsStyleSet::eAgentSheet,
                               nsLayoutStylesheetCache::UASheet());
 
-  nsCOMPtr<nsIStyleSheetService> dummy =
-    do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
-
-  nsStyleSheetService *sheetService = nsStyleSheetService::gInstance;
+  nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
   if (sheetService) {
     sheetService->AgentStyleSheets()->EnumerateForwards(AppendAgentSheet,
                                                         styleSet);

layout/base/nsStyleSheetService.cpp

@@ -240,6 +240,21 @@ nsStyleSheetService::UnregisterSheet(nsIURI *sheetURI, uint32_t aSheetType)
   return NS_OK;
 }
 
+//static
+nsStyleSheetService *
+nsStyleSheetService::GetInstance()
+{
+  static bool first = true;
+  if (first) {
+    // make sure at first call that it's inited
+    nsCOMPtr<nsIStyleSheetService> dummy =
+      do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
+    first = false;
+  }
+
+  return gInstance;
+}
+
 size_t
 nsStyleSheetService::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf)
 {

layout/base/nsStyleSheetService.h

@@ -41,6 +41,7 @@ class nsStyleSheetService MOZ_FINAL : public nsIStyleSheetService
 
   static size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf);
 
+  static nsStyleSheetService *GetInstance();
   static nsStyleSheetService *gInstance;
 
  private:

layout/style/nsStyleSet.cpp

@@ -363,7 +363,7 @@ nsStyleSet::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument)
   nsCOMArray<nsIStyleSheet>& docSheets = mSheets[eDocSheet];
 
   docSheets.RemoveObject(aSheet);
-  nsStyleSheetService *sheetService = nsStyleSheetService::gInstance;
+  nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
 
   // lowest index first
   int32_t newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet);