Change Page::m_mainFrame to be a Frame.

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 760ec5fb3ca694f8408889b177226aedc70fcbfa..982422b1606fd7d2aa2d59805eeb42642a8603cb 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -191,15 +191,15 @@ void Internals::resetToConsistentState(Page* page)
     delete s_pagePopupDriver;
     s_pagePopupDriver = 0;
     page->chrome().client().resetPagePopupDriver();
-    if (!page->mainFrame()->spellChecker().isContinuousSpellCheckingEnabled())
-        page->mainFrame()->spellChecker().toggleContinuousSpellChecking();
-    if (page->mainFrame()->editor().isOverwriteModeEnabled())
-        page->mainFrame()->editor().toggleOverwriteModeEnabled();
+    if (!toLocalFrame(page->mainFrame())->spellChecker().isContinuousSpellCheckingEnabled())
+        toLocalFrame(page->mainFrame())->spellChecker().toggleContinuousSpellChecking();
+    if (toLocalFrame(page->mainFrame())->editor().isOverwriteModeEnabled())
+        toLocalFrame(page->mainFrame())->editor().toggleOverwriteModeEnabled();
 
     if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
         scrollingCoordinator->reset();
 
-    page->mainFrame()->view()->clear();
+    toLocalFrame(page->mainFrame())->view()->clear();
 }
 
 Internals::Internals(Document* document)
@@ -728,7 +728,7 @@ void Internals::setEnableMockPagePopup(bool enabled, ExceptionState& exceptionSt
         return;
     }
     if (!s_pagePopupDriver)
-        s_pagePopupDriver = MockPagePopupDriver::create(page->mainFrame()).leakPtr();
+        s_pagePopupDriver = MockPagePopupDriver::create(toLocalFrame(page->mainFrame())).leakPtr();
     page->chrome().client().setPagePopupDriver(s_pagePopupDriver);
 }
 
@@ -899,7 +899,7 @@ String Internals::viewportAsText(Document* document, float, int availableWidth,
 
     // Update initial viewport size.
     IntSize initialViewportSize(availableWidth, availableHeight);
-    document->page()->mainFrame()->view()->setFrameRect(IntRect(IntPoint::zero(), initialViewportSize));
+    toLocalFrame(document->page()->mainFrame())->view()->setFrameRect(IntRect(IntPoint::zero(), initialViewportSize));
 
     ViewportDescription description = page->viewportDescription();
     PageScaleConstraints constraints = description.resolve(initialViewportSize, Length());