All ChromeVox bugs should be OS:Chrome by default. We can remove in the rare case where it's not.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/99e1012309d7f5f7eea0ff2157f06de806b3362c

commit 99e1012309d7f5f7eea0ff2157f06de806b3362c
Author: dtseng <dtseng@chromium.org>
Date: Fri Mar 10 19:28:05 2017

Minimize the Classic API and enable it for Next

TEST=manual; verify Docs, Sheets, and Slides work with regard to whitespace, key echo, etc when braille mode is off.
BUG= 690635 , 690636 , 618099 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2740793002
Cr-Commit-Position: refs/heads/master@{#456133}

[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/BUILD.gn
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/api.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/api_implementation.js
[delete] https://crrev.com/b6b3ddb97f0813f12cd304f3b125d17393920350/chrome/browser/resources/chromeos/chromevox/chromevox/injected/api_util.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/event_watcher.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/init_globals.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/navigation_manager.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/script_installer.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/chromevox/injected/ui/widget.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/common/chromevox.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/cvox2/background/chromevox_state.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/cvox2/background/keyboard_handler.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/cvox2/injected/loader.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/extensions/searchvox/results.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/host/chrome/host.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/host/chrome/mathjax.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/host/interface/abstract_host.js
[modify] https://crrev.com/99e1012309d7f5f7eea0ff2157f06de806b3362c/chrome/browser/resources/chromeos/chromevox/manifest.json.jinja2