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The API is now accessible from browser, so there is no need
for special handling in renderer.
This unblocks moving DevToolsAgent to blink.

Bug: 776009
Change-Id: Ie2b96e2fa99a613cbc26ec6703afe7d940d3d3c8
Reviewed-on: https://chromium-review.googlesource.com/828292
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524500}