[ios] Fix uses of ios::ChromeBrowserState in /ios/chrome/browser/ui/voice

The ChromeBrowserState has been moved from the "ios" namespace
to the global namespace by http://crrev.com/c/2014913. Fix the
uses from ios::ChromeBrowserState to ChromeBrowserState.

Also remove includes of chrome_browser_state_forward.h and use
a simple forward declaration instead (since the old name is no
longer necessary).

This CL was uploaded by git cl split.

R=djean@chromium.org

Bug: 1042208
Change-Id: I06b3d8fcec1b1b1604f9086b34e865049343badc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017367
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: David Jean <djean@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735882}

ios/chrome/browser/ui/voice/text_to_speech_playback_controller_factory.h

@@ -8,8 +8,8 @@
 #include "base/macros.h"
 #include "base/no_destructor.h"
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
-#include "ios/chrome/browser/browser_state/chrome_browser_state_forward.h"
 
+class ChromeBrowserState;
 class TextToSpeechPlaybackController;
 
 // TextToSpeechPlaybackControllerFactory attaches
@@ -20,7 +20,7 @@ class TextToSpeechPlaybackControllerFactory
   // Convenience getter that typecasts the value returned to a
   // TextToSpeechPlaybackController.
   static TextToSpeechPlaybackController* GetForBrowserState(
-      ios::ChromeBrowserState* browser_state);
+      ChromeBrowserState* browser_state);
   // Getter for singleton instance.
   static TextToSpeechPlaybackControllerFactory* GetInstance();
 

ios/chrome/browser/ui/voice/text_to_speech_playback_controller_factory.mm

@@ -19,7 +19,7 @@
 // static
 TextToSpeechPlaybackController*
 TextToSpeechPlaybackControllerFactory::GetForBrowserState(
-    ios::ChromeBrowserState* browser_state) {
+    ChromeBrowserState* browser_state) {
   return static_cast<TextToSpeechPlaybackController*>(
       GetInstance()->GetServiceForBrowserState(browser_state, true));
 }