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This CL converts TestRunner mojom interface client in chrome to
use BrowserInterfaceBroker and introduces
WebUITestContentBrowserClient class and overrides
ChromeContentBrowserClient::RegisterBrowserInterfaceBindersForFrame
to register its binder.

This change also updates JS files in closure_compile for Mojo
bindInterface and interface_definition.tmpl for WebUI tests.

Bug: 1006361, 1002647
Change-Id: Id830ef957eeb8b33ee47ff22918cb98b5c7f6650
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900798Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#715937}