Introduce "disable-speech-api" content flag and add it to WebView.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1215 matching lines @@
     switches::kDisableLogging,
     switches::kDisableMediaSource,
     switches::kDisableMojoChannel,
     switches::kDisableNewVideoRenderer,
     switches::kDisableNotifications,
     switches::kDisableOverlayScrollbar,
     switches::kDisablePinch,
     switches::kDisablePrefixedEncryptedMedia,
     switches::kDisableSeccompFilterSandbox,
     switches::kDisableSharedWorkers,
+    switches::kDisableSpeech,
     switches::kDisableSVG1DOM,
     switches::kDisableThreadedCompositing,
     switches::kDisableThreadedScrolling,
     switches::kDisableTouchAdjustment,
     switches::kDisableTouchDragDrop,
     switches::kDisableTouchEditing,
     switches::kDisableV8IdleTasks,
     switches::kDomAutomationController,
     switches::kEnableBeginFrameScheduling,
     switches::kEnableBleedingEdgeRenderingFastPaths,
@@ skipping 1210 matching lines @@
   if (worker_ref_count_ == 0)
     Cleanup();
 }
 
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 }  // namespace content