Remove WebThemeEngine

sky/engine/public/platform/Platform.h

Index: sky/engine/public/platform/Platform.h
diff --git a/sky/engine/public/platform/Platform.h b/sky/engine/public/platform/Platform.h
index 514f7b9908b101de1e7333d091339089874aa508..9fe0a546290813b3c5de89db8dea75b850d96b3a 100644
--- a/sky/engine/public/platform/Platform.h
+++ b/sky/engine/public/platform/Platform.h
@@ -64,7 +64,6 @@ class WebGestureCurve;
 class WebGraphicsContext3DProvider;
 class WebSandboxSupport;
 struct WebFloatPoint;
-class WebThemeEngine;
 class WebURL;
 class WebURLLoader;
 class WebUnitTestSupport;
@@ -86,10 +85,6 @@ public:
     // May return null if sandbox support is not necessary
     virtual WebSandboxSupport* sandboxSupport() { return 0; }
 
-    // May return null on some platforms.
-    virtual WebThemeEngine* themeEngine() { return 0; }
-
-    virtual WebFallbackThemeEngine* fallbackThemeEngine() { return 0; }
 
     // Blob ----------------------------------------------------------------