Revert r70896 to move speech input back behind a flag.

chrome/renderer/render_thread.cc

Index: chrome/renderer/render_thread.cc
diff --git a/chrome/renderer/render_thread.cc b/chrome/renderer/render_thread.cc
index 2d9c465da104b89575e0614a9a251436666abc99..92110a56f4e994d5de7d217ec38363e94b0a1c73 100644
--- a/chrome/renderer/render_thread.cc
+++ b/chrome/renderer/render_thread.cc
@@ -265,6 +265,7 @@ void RenderThread::Init() {
   is_extension_process_ = type_str == switches::kExtensionProcess ||
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
   is_incognito_process_ = false;
+  is_speech_input_enabled_ = false;
   suspend_webkit_shared_timer_ = true;
   notify_webkit_of_modal_loop_ = true;
   plugin_refresh_allowed_ = true;
@@ -638,11 +639,18 @@ bool RenderThread::OnControlMessageReceived(const IPC::Message& msg) {
                         OnSpellCheckEnableAutoSpellCorrect)
     IPC_MESSAGE_HANDLER(ViewMsg_GpuChannelEstablished, OnGpuChannelEstablished)
     IPC_MESSAGE_HANDLER(ViewMsg_SetPhishingModel, OnSetPhishingModel)
+    IPC_MESSAGE_HANDLER(ViewMsg_SpeechInput_SetFeatureEnabled,
+                        OnSetSpeechInputEnabled)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void RenderThread::OnSetSpeechInputEnabled(bool enabled) {
+  DCHECK(!webkit_client_.get());
+  is_speech_input_enabled_ = enabled;
+}
+
 void RenderThread::OnSetNextPageID(int32 next_page_id) {
   // This should only be called at process initialization time, so we shouldn't
   // have to worry about thread-safety.
@@ -944,8 +952,7 @@ void RenderThread::EnsureWebKitInitialized() {
   WebRuntimeFeatures::enableDeviceOrientation(
       !command_line.HasSwitch(switches::kDisableDeviceOrientation));
 
-  WebRuntimeFeatures::enableSpeechInput(
-      !command_line.HasSwitch(switches::kDisableSpeechInput));
+  WebRuntimeFeatures::enableSpeechInput(is_speech_input_enabled_);
 
   WebRuntimeFeatures::enableFileSystem(
       !command_line.HasSwitch(switches::kDisableFileSystem));