Always show x-webkit-speech icon for ease of testing.

Because of a behavior change of crbug.com/325496, we need to focus on an INPUT
element, move mouse pointer on it, or style it so that it works as ever before
clicking the x-webkit-speech icon.

Without this CL, WebViewTest.SpeechRecognition will fail when
https://codereview.chromium.org/100793006/ is laned.

BUG=325496
TBR=fsamuel@chromium.org

Review URL: https://codereview.chromium.org/116523005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241059 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241059