Reduce the size of frame_loader.h.

frame_loader.h is used in 1,500+ compilation units, and this CL reduces
its pre-processed size by 1.85MB.

Bug: 242216
Change-Id: Iebe8791e0661f8bce25865fb5f396f03c344322d
Reviewed-on: https://chromium-review.googlesource.com/1229723
Reviewed-by: Daniel Bratell <bratell@opera.com>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591982}
13 files changed