Bug 1519001 - Rename some style sheet accessors on nsLayoutStylesheetCache to indicate they can return null r=xidorn

Differential Revision: https://phabricator.services.mozilla.com/D16150

--HG--
extra : moz-landing-system : lando

dom/ipc/ContentParent.cpp

@@ -2497,7 +2497,7 @@ void ContentParent::InitInternal(ProcessPriority aInitialPriority) {
 
   // Content processes have no permission to access profile directory, so we
   // send the file URL instead.
-  StyleSheet* ucs = nsLayoutStylesheetCache::Singleton()->UserContentSheet();
+  StyleSheet* ucs = nsLayoutStylesheetCache::Singleton()->GetUserContentSheet();
   if (ucs) {
     SerializeURI(ucs->GetSheetURI(), xpcomInit.userContentSheetURL());
   } else {

layout/base/nsDocumentViewer.cpp

@@ -2299,12 +2299,9 @@ UniquePtr<ServoStyleSet> nsDocumentViewer::CreateStyleSet(Document* aDocument) {
   auto cache = nsLayoutStylesheetCache::Singleton();
 
   // Handle the user sheets.
-  StyleSheet* sheet = nullptr;
-  if (nsContentUtils::IsInChromeDocshell(aDocument)) {
-    sheet = cache->UserChromeSheet();
-  } else {
-    sheet = cache->UserContentSheet();
-  }
+  StyleSheet* sheet = nsContentUtils::IsInChromeDocshell(aDocument)
+                          ? cache->GetUserChromeSheet()
+                          : cache->GetUserContentSheet();
 
   if (sheet) {
     styleSet->AppendStyleSheet(SheetType::User, sheet);

layout/style/nsLayoutStylesheetCache.cpp

@@ -59,11 +59,11 @@ nsresult nsLayoutStylesheetCache::Observe(nsISupports* aSubject,
 #include "mozilla/UserAgentStyleSheetList.h"
 #undef STYLE_SHEET
 
-StyleSheet* nsLayoutStylesheetCache::UserContentSheet() {
+StyleSheet* nsLayoutStylesheetCache::GetUserContentSheet() {
   return mUserContentSheet;
 }
 
-StyleSheet* nsLayoutStylesheetCache::UserChromeSheet() {
+StyleSheet* nsLayoutStylesheetCache::GetUserChromeSheet() {
   return mUserChromeSheet;
 }
 

layout/style/nsLayoutStylesheetCache.h

@@ -43,8 +43,8 @@ class nsLayoutStylesheetCache final : public nsIObserver,
 #include "mozilla/UserAgentStyleSheetList.h"
 #undef STYLE_SHEET
 
-  mozilla::StyleSheet* UserContentSheet();
-  mozilla::StyleSheet* UserChromeSheet();
+  mozilla::StyleSheet* GetUserContentSheet();
+  mozilla::StyleSheet* GetUserChromeSheet();
   mozilla::StyleSheet* ChromePreferenceSheet(nsPresContext* aPresContext);
   mozilla::StyleSheet* ContentPreferenceSheet(nsPresContext* aPresContext);