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Convert this message to a mojo message like ClearCache.

The associated channel can be bound when the AwRenderProcess object is
created because it doesn't need to be in the Ready state for it to get
attached. Likewise this object will be deleted when the render process
terminates so it doesn't need to worry about rebinding the mojo channel.

BUG=1146490

Change-Id: I2e3d6888debf85570117ba79fece34530fa12b50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522961
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825382}