Move host resource from the proxy to the shared_impl.

ppapi/proxy/ppb_file_system_proxy.h

Index: ppapi/proxy/ppb_file_system_proxy.h
diff --git a/ppapi/proxy/ppb_file_system_proxy.h b/ppapi/proxy/ppb_file_system_proxy.h
index dcf94b37221be71af10c6bc3389340a3768b9921..795abcb938905782cdcf8fa372d00adf2fc0e9d9 100644
--- a/ppapi/proxy/ppb_file_system_proxy.h
+++ b/ppapi/proxy/ppb_file_system_proxy.h
@@ -18,11 +18,13 @@
 
 struct PPB_FileSystem_Dev;
 
+namespace ppapi {
+class HostResource;
+}
+
 namespace pp {
 namespace proxy {
 
-class HostResource;
-
 class PPB_FileSystem_Proxy : public InterfaceProxy {
  public:
   PPB_FileSystem_Proxy(Dispatcher* dispatcher, const void* target_interface);
@@ -40,14 +42,15 @@ class PPB_FileSystem_Proxy : public InterfaceProxy {
   // Message handlers.
   void OnMsgCreate(PP_Instance instance,
                    int type,
-                   HostResource* result);
-  void OnMsgOpen(const HostResource& filesystem,
+                   ppapi::HostResource* result);
+  void OnMsgOpen(const ppapi::HostResource& filesystem,
                  int64_t expected_size);
 
-  void OnMsgOpenComplete(const HostResource& filesystem,
+  void OnMsgOpenComplete(const ppapi::HostResource& filesystem,
                          int32_t result);
 
-  void OpenCompleteInHost(int32_t result, const HostResource& host_resource);
+  void OpenCompleteInHost(int32_t result,
+                          const ppapi::HostResource& host_resource);
 
   CompletionCallbackFactory<PPB_FileSystem_Proxy,
                             ProxyNonThreadSafeRefCount> callback_factory_;