PPAPI: Refactor renderer side of browser host creation

content/renderer/pepper/mock_renderer_ppapi_host.h

Index: content/renderer/pepper/mock_renderer_ppapi_host.h
diff --git a/content/renderer/pepper/mock_renderer_ppapi_host.h b/content/renderer/pepper/mock_renderer_ppapi_host.h
index 74cff72a40d8e93df2680e0f36f2cf6909cf77aa..69dee7233992267c983f6ca6df28a210c44d1e81 100644
--- a/content/renderer/pepper/mock_renderer_ppapi_host.h
+++ b/content/renderer/pepper/mock_renderer_ppapi_host.h
@@ -50,10 +50,10 @@ class MockRendererPpapiHost : public RendererPpapiHost {
   bool IsRunningInProcess() const override;
   std::string GetPluginName() const override;
   void SetToExternalPluginHost() override;
-  void CreateBrowserResourceHosts(
+  int32_t CreateBrowserResourceHosts(
       PP_Instance instance,
       const std::vector<IPC::Message>& nested_msgs,
-      const base::Callback<void(const std::vector<int>&)>& callback)
+      const PendingResourceCallback& callback)
       const override;
   GURL GetDocumentURL(PP_Instance instance) const override;