Revert r70896 to move speech input back behind a flag.

chrome/renderer/render_thread.h

Index: chrome/renderer/render_thread.h
diff --git a/chrome/renderer/render_thread.h b/chrome/renderer/render_thread.h
index 886c3255271c6c176c4a21e768c1683ba3a4b391..6817cfb62b6e0f51f8134db100f55a0db191fae5 100644
--- a/chrome/renderer/render_thread.h
+++ b/chrome/renderer/render_thread.h
@@ -316,6 +316,8 @@ class RenderThread : public RenderThreadBase,
 
   void OnGetAccessibilityTree();
 
+  void OnSetSpeechInputEnabled(bool enabled);
+
   // Gather usage statistics from the in-memory cache and inform our host.
   // These functions should be call periodically so that the host can make
   // decisions about how to allocation resources using current information.
@@ -386,6 +388,10 @@ class RenderThread : public RenderThreadBase,
   bool suspend_webkit_shared_timer_;
   bool notify_webkit_of_modal_loop_;
 
+  // True if this renderer has speech input enabled, set once during thread
+  // initialization.
+  bool is_speech_input_enabled_;
+
   // Timer that periodically calls IdleHandler.
   base::RepeatingTimer<RenderThread> idle_timer_;