The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069

commit e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069
Author: pmonette <pmonette@chromium.org>
Date: Fri Jun 17 22:14:21 2016

Add the UtilityProcessMojoClient class and convert SafeJsonParser

This class takes care of the mundane job of managing the utility process
lifetime and connecting to the remote Mojo service in an effort to make
it very easy to add new Mojo services that run on a utility process.

As a first example, SafeJsonParser is converted to use this class.

BUG= 618459 

Review-Url: https://codereview.chromium.org/2049303002
Cr-Commit-Position: refs/heads/master@{#400522}

[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/components/safe_json/safe_json_parser_impl.cc
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/components/safe_json/safe_json_parser_impl.h
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/browser/service_worker/service_worker_version_unittest.cc
[add] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/browser/utility_process_mojo_client_browsertest.cc
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/content_browser.gypi
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/content_tests.gypi
[add] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/public/browser/utility_process_mojo_client.h
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/public/test/test_mojo_app.cc
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/public/test/test_mojo_app.h
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/public/test/test_mojo_service.mojom
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/shell/renderer/shell_content_renderer_client.cc
[modify] https://crrev.com/e6f1ea1a8b2145019c3e7a7248ab1fc1d880b069/content/shell/utility/shell_content_utility_client.cc