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This saves about 90 kB of Android APK size, and should be nearly as fast. This
adds up mainly because we have a sufficient number of Mojo methods that this
code is very heavily repeated.

For example, network::mojom::NetworkContextRequestValidator::Accept (1,592 bytes)
is replaced with a 24-byte function and a 720-byte table, and the strings
"NetworkContext RequestValidator" and "NetworkContext ResponseValidator" are
replaced with a single "NetworkContext" that may even be further deduped.

Change-Id: I772145a839b9607098311b3309fd49e94e43991e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896773
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713576}