Revert of Move testRunner.startSpeechInput/setValueForUser to internals

Revert of Move testRunner.startSpeechInput/setValueForUser to internals (https://codereview.chromium.org/176953009/)

Reason for revert:
Broke the Android compile:
  http://build.chromium.org/p/chromium.webkit/builders/Android%20Builder%20%28dbg%29/builds/25493/steps/compile/logs/stdio

Android does not enable speech input, and the methods called are guarded behind the ENABLE_INPUT_SPEECH compile-time flag. The testing code in Internals.cpp should also be guarded with the same flag.

Original issue's description:
> Move testRunner.startSpeechInput/setValueForUser to internals
> 
> Now TestRunner is being moved from CppBoundClass to gin::Wrappable,
> where it is not appropriate to use WebElements directly. This CL moves
> some functions which treats WebElement* from testRunner to internals.
> (To be exact, this CL only copies some functions, but I'll remove those ones
> in testRunner later.)
> 
> BUG=331301
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168495

TBR=haraken@chromium.org,hajimehoshi@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=331301
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168498

[Peter Beverloo, 2014-03-05 17:40:31]

Created Revert of Move testRunner.startSpeechInput/setValueForUser to internals

[commit-bot: I haz the power, 2014-03-05 17:41:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/peter@chromium.org/187903004/1

[commit-bot: I haz the power, 2014-03-05 17:42:55]

Change committed as 168498