Convert page-level classes to handle RemoteFrames from FrameTree

Source/core/page/InjectedStyleSheets.cpp

Index: Source/core/page/InjectedStyleSheets.cpp
diff --git a/Source/core/page/InjectedStyleSheets.cpp b/Source/core/page/InjectedStyleSheets.cpp
index 80c971bf4fcbc4b123b72f74db73e47aa95c3991..c5760054d6f1cd4cbc4566dcf7ad8dd229aaae29 100644
--- a/Source/core/page/InjectedStyleSheets.cpp
+++ b/Source/core/page/InjectedStyleSheets.cpp
@@ -55,8 +55,10 @@ void InjectedStyleSheets::invalidateInjectedStyleSheetCacheInAllFrames()
 
     HashSet<Page*>::const_iterator end = pages.end();
     for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
-        for (LocalFrame* frame = (*it)->mainFrame(); frame; frame = frame->tree().traverseNext())
-            frame->document()->styleEngine()->invalidateInjectedStyleSheetCache();
+        for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree().traverseNext()) {
+            if (frame->isLocalFrame())
+                toLocalFrame(frame)->document()->styleEngine()->invalidateInjectedStyleSheetCache();
+        }
     }
 }