Add a unified resource tracker shared between the proxy and the impl.

ppapi/proxy/ppb_flash_file_proxy.cc

Index: ppapi/proxy/ppb_flash_file_proxy.cc
diff --git a/ppapi/proxy/ppb_flash_file_proxy.cc b/ppapi/proxy/ppb_flash_file_proxy.cc
index 73e8a2d8ed0801a377f87980714e04f998c2fb4e..9400728341fa417c223d6dc2ea3b9138890db349 100644
--- a/ppapi/proxy/ppb_flash_file_proxy.cc
+++ b/ppapi/proxy/ppb_flash_file_proxy.cc
@@ -20,10 +20,12 @@
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/c/private/ppb_flash_file.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
-#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/resource.h"
 
 using ppapi::HostResource;
+using ppapi::Resource;
 
 namespace pp {
 namespace proxy {
@@ -625,13 +627,12 @@ namespace {
 int32_t OpenFileRefFile(PP_Resource file_ref_id,
                         int32_t mode,
                         PP_FileHandle* file) {
-  PluginResource* file_ref =
-      PluginResourceTracker::GetInstance()->GetResourceObject(file_ref_id);
+  Resource* file_ref =
+      PluginResourceTracker::GetInstance()->GetResource(file_ref_id);
   if (!file_ref)
     return PP_ERROR_BADRESOURCE;
 
-  PluginDispatcher* dispatcher =
-      PluginDispatcher::GetForInstance(file_ref->instance());
+  PluginDispatcher* dispatcher = PluginDispatcher::GetForResource(file_ref);
   if (!dispatcher)
     return PP_ERROR_BADARGUMENT;
 
@@ -646,13 +647,12 @@ int32_t OpenFileRefFile(PP_Resource file_ref_id,
 
 int32_t QueryFileRefFile(PP_Resource file_ref_id,
                          PP_FileInfo* info) {
-  PluginResource* file_ref =
-      PluginResourceTracker::GetInstance()->GetResourceObject(file_ref_id);
+  Resource* file_ref =
+      PluginResourceTracker::GetInstance()->GetResource(file_ref_id);
   if (!file_ref)
     return PP_ERROR_BADRESOURCE;
 
-  PluginDispatcher* dispatcher =
-      PluginDispatcher::GetForInstance(file_ref->instance());
+  PluginDispatcher* dispatcher = PluginDispatcher::GetForResource(file_ref);
   if (!dispatcher)
     return PP_ERROR_BADARGUMENT;