[ios] Remove BrowserState API of VoiceSearchProvider

Remove API now that codebase calls Browser API

Bug: 790886
Change-Id: I8ec3b8cae8621c47e31236d6a5552e35c478556a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144463Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758532}

ios/public/provider/chrome/browser/voice/voice_search_provider.h

@@ -14,7 +14,6 @@
 @protocol ApplicationCommands;
 class AudioSessionController;
 class Browser;
-class ChromeBrowserState;
 class VoiceSearchController;
 
 // VoiceSearchProvider allows embedders to provide functionality related to
@@ -34,12 +33,7 @@ class VoiceSearchProvider {
   // Returns the singleton audio session controller.
   virtual AudioSessionController* GetAudioSessionController() const;
 
-  // Creates a new VoiceSearchController object. TODO(crbug.com/790886): Remove
-  // the ChromeBrowserState constructor when the implementation for the Browser
-  // constructor finishes and all calls use that constructor. This is a part of
-  // the Brower-scoped migration.
-  virtual scoped_refptr<VoiceSearchController> CreateVoiceSearchController(
-      ChromeBrowserState* browser_state) const;
+  // Creates a new VoiceSearchController object.
   virtual scoped_refptr<VoiceSearchController> CreateVoiceSearchController(
       Browser* browser) const;
 

ios/public/provider/chrome/browser/voice/voice_search_provider.mm

@@ -22,12 +22,6 @@ AudioSessionController* VoiceSearchProvider::GetAudioSessionController() const {
   return nullptr;
 }
 
-scoped_refptr<VoiceSearchController>
-VoiceSearchProvider::CreateVoiceSearchController(
-    ChromeBrowserState* browser_state) const {
-  return scoped_refptr<VoiceSearchController>(nullptr);
-}
-
 scoped_refptr<VoiceSearchController>
 VoiceSearchProvider::CreateVoiceSearchController(Browser* browser) const {
   return scoped_refptr<VoiceSearchController>(nullptr);