Revert of Allow std::unordered_*.

cc/layers/delegated_renderer_layer_impl.cc

Index: cc/layers/delegated_renderer_layer_impl.cc
diff --git a/cc/layers/delegated_renderer_layer_impl.cc b/cc/layers/delegated_renderer_layer_impl.cc
index 8158edcf2ed96dab3aa8b22931fe459dad0b87f7..5d511168a9b44d22c51913e7b7e165817faab72d 100644
--- a/cc/layers/delegated_renderer_layer_impl.cc
+++ b/cc/layers/delegated_renderer_layer_impl.cc
@@ -109,7 +109,16 @@
   bool invalid_frame = false;
   ResourceProvider::ResourceIdSet resources_in_frame;
   size_t reserve_size = frame_data->resource_list.size();
+#if defined(COMPILER_MSVC)
   resources_in_frame.reserve(reserve_size);
+#elif defined(COMPILER_GCC)
+  // Pre-standard hash-tables only implement resize, which behaves similarly
+  // to reserve for these keys. Resizing to 0 may also be broken (particularly
+  // on stlport).
+  // TODO(jbauman): Replace with reserve when C++11 is supported everywhere.
+  if (reserve_size)
+    resources_in_frame.resize(reserve_size);
+#endif
   for (const auto& pass : render_pass_list) {
     for (const auto& quad : pass->quad_list) {
       for (ResourceId& resource_id : quad->resources) {