The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/48e31159a123a0f7e3f3e45b7e28a136408ddf3a

commit 48e31159a123a0f7e3f3e45b7e28a136408ddf3a
Author: robliao <robliao@chromium.org>
Date: Fri Apr 29 20:29:31 2016

Introduce ScopedCommandLine

A few tests other there have the need to manipulate the command line and
restore it after the test. ScopedCommandLine provides an easy way to
set the options you need and then restore them when the ScopedCommandLine
is out of scope.

This also cleans up some other tests that were storing away the command line. This is unnecessary as the test infrastructure cleans this up (see TestClientInitializer)

BUG= 604961 

Review-Url: https://codereview.chromium.org/1908633002
Cr-Commit-Position: refs/heads/master@{#390741}

[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/base/base.gyp
[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/base/test/BUILD.gn
[add] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/base/test/scoped_command_line.cc
[add] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/base/test/scoped_command_line.h
[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/chrome/browser/chromeos/events/event_rewriter_unittest.cc
[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/chrome/browser/extensions/activity_log/activity_log_enabled_unittest.cc
[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/chrome/browser/extensions/activity_log/counting_policy_unittest.cc
[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/chrome/browser/extensions/activity_log/fullstream_ui_policy_unittest.cc
[modify] https://crrev.com/48e31159a123a0f7e3f3e45b7e28a136408ddf3a/extensions/common/features/simple_feature_unittest.cc

Remaining items: Evaluate usage in

TestClientInitializer
https://code.google.com/p/chromium/codesearch#chromium/src/base/test/test_suite.cc

extensions::ActivityLogApiTest
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/extensions/api/activity_log_private/activity_log_private_apitest.cc

Closing this for now as the primary body of work is done.