Change Page::m_mainFrame to be a Frame.

Source/core/rendering/TextAutosizer.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 159 matching lines @@
         m_hashCache.add(renderer, combinedHashValue);
     return combinedHashValue;
 }
 
 bool TextAutosizer::isApplicable() const
 {
     return m_document->settings()
         && m_document->settings()->textAutosizingEnabled()
         && m_document->page()
         && m_document->page()->mainFrame()
-        && m_document->page()->mainFrame()->loader().stateMachine()->committedFirstRealDocumentLoad();
+        && toLocalFrame(m_document->page()->mainFrame())->loader().stateMachine()->committedFirstRealDocumentLoad();
 }
 
 void TextAutosizer::recalculateMultipliers()
 {
     if (!isApplicable() && !m_previouslyAutosized)
         return;
 
     RenderObject* renderer = m_document->renderView();
     while (renderer) {
         if (renderer->style() && renderer->style()->textAutosizingMultiplier() != 1)
             setMultiplier(renderer, 1);
         renderer = renderer->nextInPreOrder();
     }
     m_previouslyAutosized = false;
 }
 
 bool TextAutosizer::processSubtree(RenderObject* layoutRoot)
 {
     TRACE_EVENT0("webkit", "TextAutosizer: check if needed");
 
     if (!isApplicable() || layoutRoot->view()->document().printing())
         return false;
 
-    LocalFrame* mainFrame = m_document->page()->mainFrame();
+    LocalFrame* mainFrame = toLocalFrame(m_document->page()->mainFrame());
     TextAutosizingWindowInfo windowInfo;
 
     // Window area, in logical (density-independent) pixels.
     windowInfo.windowSize = m_document->settings()->textAutosizingWindowSizeOverride();
     if (windowInfo.windowSize.isEmpty())
         windowInfo.windowSize = mainFrame->view()->unscaledVisibleContentSize(IncludeScrollbars);
 
     // Largest area of block that can be visible at once (assuming the main
     // frame doesn't get scaled to less than overview scale), in CSS pixels.
     windowInfo.minLayoutSize = mainFrame->view()->layoutSize();
     for (Frame* frame = m_document->frame(); frame; frame = frame->tree().parent()) {
-        if (frame->isLocalFrame())
-            windowInfo.minLayoutSize = windowInfo.minLayoutSize.shrunkTo(toLocalFrame(frame)->view()->layoutSize());
+        windowInfo.minLayoutSize = windowInfo.minLayoutSize.shrunkTo(toLocalFrame(frame)->view()->layoutSize());
     }
 
     // The layoutRoot could be neither a container nor a cluster, so walk up the tree till we find each of these.
     RenderBlock* container = layoutRoot->isRenderBlock() ? toRenderBlock(layoutRoot) : layoutRoot->containingBlock();
     while (container && !isAutosizingContainer(container))
         container = container->containingBlock();
 
     RenderBlock* cluster = container;
     while (cluster && (!isAutosizingContainer(cluster) || !isIndependentDescendant(cluster)))
         cluster = cluster->containingBlock();
@@ skipping 27 matching lines @@
 {
     int logicalWindowWidth = isHorizontalWritingMode(writingMode) ? windowInfo.windowSize.width() : windowInfo.windowSize.height();
     int logicalLayoutWidth = isHorizontalWritingMode(writingMode) ? windowInfo.minLayoutSize.width() : windowInfo.minLayoutSize.height();
     // Ignore box width in excess of the layout width, to avoid extreme multipliers.
     float logicalClusterWidth = std::min<float>(textWidth, logicalLayoutWidth);
 
     float multiplier = logicalClusterWidth / logicalWindowWidth;
     multiplier *= m_document->settings()->accessibilityFontScaleFactor();
 
     // If the page has a meta viewport or @viewport, don't apply the device scale adjustment.
-    const ViewportDescription& viewportDescription = m_document->page()->mainFrame()->document()->viewportDescription();
+    const ViewportDescription& viewportDescription = toLocalFrame(m_document->page()->mainFrame())->document()->viewportDescription();
     if (!viewportDescription.isSpecifiedByAuthor()) {
         float deviceScaleAdjustment = m_document->settings()->deviceScaleAdjustment();
         multiplier *= deviceScaleAdjustment;
     }
     return std::max(1.0f, multiplier);
 }
 
 void TextAutosizer::processClusterInternal(TextAutosizingClusterInfo& clusterInfo, RenderBlock* container, RenderObject* subtreeRoot, const TextAutosizingWindowInfo& windowInfo, float multiplier)
 {
     processContainer(multiplier, container, clusterInfo, subtreeRoot, windowInfo);
@@ skipping 572 matching lines @@
         if (i + 1 < clusterInfos.size()) {
             LayoutUnit currentWidth = clusterInfos[i].root->contentLogicalWidth();
             LayoutUnit nextWidth = clusterInfos[i + 1].root->contentLogicalWidth();
             if (currentWidth - nextWidth > maxWidthDifferenceWithinGroup)
                 groups.grow(groups.size() + 1);
         }
     }
 }
 
 } // namespace WebCore