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This CL migrates the legacy ReplicateWebTestRuntimeFlagsChanges IPC
message to the new Mojo defined in WebTestClient interface.

To do that, this CL needs to introduce WebTestControl interface to
send messages from the browser process to the renderer.
Then, WebTestRenderThreadObserver starts to handle incoming Mojo
requests through the RegisterMojoInterfaces implementation.

This CL renames the existing |web_test_control_map_| to
|blink_test_control_map_| in order to add a new |web_test_control_map|.

Lastly, this CL removes all things related to the legacy IPC of
the ReplicateWebTestRuntimeFlagsChanges message.

Bug: 1039247
Change-Id: Ia41ef43093d7279020bcb79986e3328ed0338f7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063610Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#745307}