Fix a recent regression in Speech->Start Speaking on Mac

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <Carbon/Carbon.h>
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
@@ skipping 1094 matching lines @@
   if (selection->selected_text().empty() && render_widget_host_) {
     // TODO: This will not work with OOPIFs (https://crbug.com/659753).
     // If there's no selection, speak all text. Send an asynchronous IPC
     // request for fetching all the text for a webcontent.
     // ViewMsg_GetRenderedTextCompleted is sent back to IPC Message receiver.
     render_widget_host_->Send(
         new ViewMsg_GetRenderedText(render_widget_host_->GetRoutingID()));
     return;
   }
 
-  SpeakText(selected_text_);
+  SpeakText(base::UTF16ToUTF8(selection->selected_text()));
 }
 
 bool RenderWidgetHostViewMac::IsSpeaking() const {
   return [NSApp respondsToSelector:@selector(isSpeaking)] && [NSApp isSpeaking];
 }
 
 void RenderWidgetHostViewMac::StopSpeaking() {
   if ([NSApp respondsToSelector:@selector(stopSpeaking:)])
     [NSApp stopSpeaking:cocoa_view_];
 }
@@ skipping 2391 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end