Enable size_t to int truncation warnings in PPAPI

ppapi/proxy/url_loader_resource.cc

Index: ppapi/proxy/url_loader_resource.cc
diff --git a/ppapi/proxy/url_loader_resource.cc b/ppapi/proxy/url_loader_resource.cc
index 73bdb2342f4e7362fd21f3fa7fd33590092fbf9b..e2978199bf1c593495a9312e5305606483417b9d 100644
--- a/ppapi/proxy/url_loader_resource.cc
+++ b/ppapi/proxy/url_loader_resource.cc
@@ -374,7 +374,7 @@ void URLLoaderResource::SaveResponseInfo(const URLResponseInfoData& data) {
       connection(), pp_instance(), data, body_as_file_ref);
 }
 
-size_t URLLoaderResource::FillUserBuffer() {
+int32_t URLLoaderResource::FillUserBuffer() {
   DCHECK(user_buffer_);
   DCHECK(user_buffer_size_);
 
@@ -393,7 +393,7 @@ size_t URLLoaderResource::FillUserBuffer() {
   // Reset for next time.
   user_buffer_ = NULL;
   user_buffer_size_ = 0;
-  return bytes_to_copy;
+  return static_cast<int32_t>(bytes_to_copy);

[dmichael (off chromium), 2015/02/12 18:56:43]

another unsigned->signed where checked_cast might be good.

 }
 
 }  // namespace proxy