Move the "platform" wrappers in skia/ext to the skia namespace.

webkit/port/rendering/RenderThemeWin.cpp

Index: webkit/port/rendering/RenderThemeWin.cpp
===================================================================
--- webkit/port/rendering/RenderThemeWin.cpp	(revision 6968)
+++ webkit/port/rendering/RenderThemeWin.cpp	(working copy)
@@ -366,7 +366,7 @@
     const ThemeData& themeData = getThemeData(o);
 
     WebCore::ThemeHelperWin helper(i.context, r);
-    gfx::PlatformCanvas* canvas = helper.context()->platformContext()->canvas();
+    skia::PlatformCanvas* canvas = helper.context()->platformContext()->canvas();
 
     HDC hdc = canvas->beginPlatformPaint();
     int state = themeData.m_state;
@@ -442,7 +442,7 @@
 
     // Get the correct theme data for a textfield and paint the menu.
     WebCore::ThemeHelperWin helper(i.context, rect);
-    gfx::PlatformCanvas* canvas = helper.context()->platformContext()->canvas();
+    skia::PlatformCanvas* canvas = helper.context()->platformContext()->canvas();
     HDC hdc = canvas->beginPlatformPaint();
     RECT renderRect = helper.rect();
     gfx::NativeTheme::instance()->PaintMenuList(hdc,
@@ -583,7 +583,7 @@
     const ThemeData& themeData = getThemeData(o);
 
     WebCore::ThemeHelperWin helper(i.context, r);
-    gfx::PlatformCanvas* canvas = helper.context()->platformContext()->canvas();
+    skia::PlatformCanvas* canvas = helper.context()->platformContext()->canvas();
 
     HDC hdc = canvas->beginPlatformPaint();
     COLORREF clr = skia::SkColorToCOLORREF(o->style()->backgroundColor().rgb());