Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

ui/ozone/platform/caca/ozone_platform_caca.cc

Index: ui/ozone/platform/caca/ozone_platform_caca.cc
diff --git a/ui/ozone/platform/caca/ozone_platform_caca.cc b/ui/ozone/platform/caca/ozone_platform_caca.cc
index b34f5ca92d19d5fd4092adaf6a0cb794010b1d7d..a74379b58ca5fbc91c17b1cc3fb9f731f5455100 100644
--- a/ui/ozone/platform/caca/ozone_platform_caca.cc
+++ b/ui/ozone/platform/caca/ozone_platform_caca.cc
@@ -34,12 +34,6 @@
   virtual CursorFactoryOzone* GetCursorFactoryOzone() OVERRIDE {
     return cursor_factory_ozone_.get();
   }
-  virtual GpuPlatformSupport* GetGpuPlatformSupport() OVERRIDE {
-    return NULL;  // no GPU support
-  }
-  virtual GpuPlatformSupportHost* GetGpuPlatformSupportHost() OVERRIDE {
-    return NULL;  // no GPU support
-  }
 
 #if defined(OS_CHROMEOS)
   virtual scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()