Introduce shared_memory_support media target for PPAPI

ppapi/native_client/src/shared/ppapi_proxy/plugin_globals.h

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_globals.h
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/plugin_globals.h b/ppapi/native_client/src/shared/ppapi_proxy/plugin_globals.h
index 79ad4e5f85f502e1369b407da52bbbae6dc8aa1c..85e494b2e77b81aca97c03f704532f58a86ca31b 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/plugin_globals.h
+++ b/ppapi/native_client/src/shared/ppapi_proxy/plugin_globals.h
@@ -77,14 +77,6 @@ const struct PP_ThreadFunctions* GetThreadCreator();
 // PPAPI constants used in the proxy.
 extern const PP_Resource kInvalidResourceId;
 
-// The following function TotalSharedMemorySizeInBytes, is copied & similar
-// to the one in audio_util.cc.  This function includes optional fields
-// stored at the end of the audio buffer.
-inline size_t TotalAudioSharedMemorySizeInBytes(size_t audio_buffer_size) {
-  // Include optional field that communicates the number of bytes written.
-  return audio_buffer_size + sizeof(uint32_t);
-}
-
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_GLOBALS_H_