Merge 171373 "Disable x-webkit-speech"

Merge 171373 "Disable x-webkit-speech"

> Disable x-webkit-speech
> 
> This does not remove the code yet, only makes x-webkit-speech
> test-only (only exposed during LayoutTests) which makes
> this patch only a one-line change. We should follow up this
> change with a full removal of this feature including
> all tests.
> 
> x-webkit-speech is a Chrome-only feature which was
> announced as deprecated Feb 2014:
> https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/jlPdpx6jErE
> Current usage is at about 0.487% of reported Chrome page views
> which is (well) above our normal 0.06% removal threshold:
> http://www.chromestatus.com/metrics/feature/popularity#PrefixedSpeechAttribute
> 
> However, hours ago we recieved report of cases where *requiring
> user interaction* speech can be captured for up to 8 seconds
> or until the user stops un-interrupted speaking without proper
> appearance of the "Allow this site to use your microphone"
> infobar.
> 
> Although this is only a medium-security issue (requires
> user interaction and very limited duration), this is still
> severe enough that we no longer believe we can support
> this deprecated, webkit-only feature.
> 
> Removing this feature will not affect mobile users
> which already have access to speech-input via various
> speech-enabled keyboards on Android.  Desktop sites which
> were using this feature can use the modern Web Speech APIs
> instead, which are standardized and supported accross many
> browsers: http://caniuse.com/web-speech
> 
> Without this feature pages will continue to work, they just
> will not be able to get speech input via <input> controls
> via these APIs and will either have to use the standard
> Web Speech APIs or depend on the operating system to expose
> speech input via other methods.
> 
> I've verified that disabling this does not affect the new
> JS Web Speech API by testing with:
> https://www.google.com/intl/en/chrome/demos/speech.html
> 
> BUG=360448
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171187
> 
> Review URL: https://codereview.chromium.org/231323003

TBR=eseidel@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173324

[eseidel, 2014-05-05 17:35:46]

Committed patchset #1 manually as r173324.