Refactor fixed layout mode

Source/core/page/Frame.cpp

Index: Source/core/page/Frame.cpp
diff --git a/Source/core/page/Frame.cpp b/Source/core/page/Frame.cpp
index 53e054b06d753d75a05b01637c2ceabc70cf190b..19641ffc8e835a926b4af812434ec71fd4fbd04e 100644
--- a/Source/core/page/Frame.cpp
+++ b/Source/core/page/Frame.cpp
@@ -448,7 +448,7 @@ PassRefPtr<Range> Frame::rangeForPoint(const IntPoint& framePoint)
 }
 
 void Frame::createView(const IntSize& viewportSize, const Color& backgroundColor, bool transparent,
-    const IntSize& fixedLayoutSize, bool useFixedLayout, ScrollbarMode horizontalScrollbarMode, bool horizontalLock,
+    ScrollbarMode horizontalScrollbarMode, bool horizontalLock,
     ScrollbarMode verticalScrollbarMode, bool verticalLock)
 {
     ASSERT(this);
@@ -464,8 +464,9 @@ void Frame::createView(const IntSize& viewportSize, const Color& backgroundColor
     RefPtr<FrameView> frameView;
     if (isMainFrame) {
         frameView = FrameView::create(this, viewportSize);
-        frameView->setFixedLayoutSize(fixedLayoutSize);
-        frameView->setUseFixedLayout(useFixedLayout);
+
+        // The layout size is set by WebViewImpl to support @viewport
+        frameView->setLayoutSizeFixedToFrameSize(false);
     } else
         frameView = FrameView::create(this);