Rename the shared impl files.

ppapi/shared_impl/ppb_image_data_shared.h

Index: ppapi/shared_impl/ppb_image_data_shared.h
diff --git a/ppapi/shared_impl/image_data_impl.h b/ppapi/shared_impl/ppb_image_data_shared.h
similarity index 83%
rename from ppapi/shared_impl/image_data_impl.h
rename to ppapi/shared_impl/ppb_image_data_shared.h
index f931c789fd0f10e5e87bef29896edc75f89a1d9c..4f9a4d5f2b145078c17938091d5d26d6e6aae282 100644
--- a/ppapi/shared_impl/image_data_impl.h
+++ b/ppapi/shared_impl/ppb_image_data_shared.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef PPAPI_SHARED_IMPL_IMAGE_DATA_IMPL_H_
-#define PPAPI_SHARED_IMPL_IMAGE_DATA_IMPL_H_
+#ifndef PPAPI_SHARED_IMPL_PPB_IMAGE_DATA_SHARED_H_
+#define PPAPI_SHARED_IMPL_PPB_IMAGE_DATA_SHARED_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/ppb_image_data.h"
@@ -20,7 +20,7 @@ namespace ppapi {
 // probably best to have some kind of "configuration" message that the renderer
 // sends to the plugin process on startup that contains all of these kind of
 // settings.
-class PPAPI_SHARED_EXPORT ImageDataImpl {
+class PPAPI_SHARED_EXPORT PPB_ImageData_Shared {
  public:
   static PP_ImageDataFormat GetNativeImageDataFormat();
   static bool IsImageDataFormatSupported(PP_ImageDataFormat format);
@@ -28,4 +28,4 @@ class PPAPI_SHARED_EXPORT ImageDataImpl {
 
 }  // namespace ppapi
 
-#endif  // PPAPI_SHARED_IMPL_IMAGE_DATA_IMPL_H_
+#endif  // PPAPI_SHARED_IMPL_PPB_IMAGE_DATA_SHARED_H_