Move host resource from the proxy to the shared_impl.

ppapi/proxy/ppb_flash_file_proxy.h

Index: ppapi/proxy/ppb_flash_file_proxy.h
diff --git a/ppapi/proxy/ppb_flash_file_proxy.h b/ppapi/proxy/ppb_flash_file_proxy.h
index e09ae5470c5b5ba51e05faede831a8c67a92d18f..3a007fe7f398b8169bba51005a5127ff32061774 100644
--- a/ppapi/proxy/ppb_flash_file_proxy.h
+++ b/ppapi/proxy/ppb_flash_file_proxy.h
@@ -17,10 +17,13 @@ struct PP_FileInfo;
 struct PPB_Flash_File_FileRef;
 struct PPB_Flash_File_ModuleLocal;
 
+namespace ppapi {
+class HostResource;
+}
+
 namespace pp {
 namespace proxy {
 
-class HostResource;
 struct SerializedDirEntry;
 
 class PPB_Flash_File_ModuleLocal_Proxy : public InterfaceProxy {
@@ -83,11 +86,11 @@ class PPB_Flash_File_FileRef_Proxy : public InterfaceProxy {
 
  private:
   // Message handlers.
-  void OnMsgOpenFile(const HostResource& host_resource,
+  void OnMsgOpenFile(const ppapi::HostResource& host_resource,
                      int32_t mode,
                      IPC::PlatformFileForTransit* file_handle,
                      int32_t* result);
-  void OnMsgQueryFile(const HostResource& host_resource,
+  void OnMsgQueryFile(const ppapi::HostResource& host_resource,
                       PP_FileInfo* info,
                       int32_t* result);
 };