Remove setVoiceSearchSupported part of EmbeddedSearch SearchBox API.

also remove the mic search view from the location bar. The NTP "omnibox" still has voice search but that's unrelated.

BUG=522168
TBR=oshima@chromium.org

Review URL: https://codereview.chromium.org/1428423002

Cr-Commit-Position: refs/heads/master@{#358641}
44 files changed