Revert "[ios] Plumb Browser to VoiceSearchController"

This reverts commit 9ac29612.

Reason for revert: Breaks downstream build.

Original change's description:
> [ios] Plumb Browser to VoiceSearchController
> 
> VoiceSearchCoordinator needs a Browser to access a Browser-scoped
> FullscreenController.
> 
> Bug: 790886
> Change-Id: I24acae364cb64ecc011375045feab66e58dd432e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132852
> Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
> Reviewed-by: Mark Cogan <marq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#756754}

TBR=marq@chromium.org,thegreenfrog@chromium.org

Change-Id: I6ad6ae1d99efd9915ecb19cfcdd572f1d46b9d76
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 790886
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138252Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756792}

ios/chrome/browser/ui/browser_view/browser_view_controller.mm

@@ -2704,7 +2704,7 @@ NSString* const kBrowserViewControllerSnackbarCategory =
         ios::GetChromeBrowserProvider()->GetVoiceSearchProvider();
     if (provider) {
       _voiceSearchController =
-          provider->CreateVoiceSearchController(self.browser);
+          provider->CreateVoiceSearchController(self.browserState);
       if (self.primaryToolbarCoordinator) {
         _voiceSearchController->SetDispatcher(
             static_cast<id<LoadQueryCommands>>(self.commandDispatcher));

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

@@ -13,7 +13,7 @@
 
 @protocol ApplicationCommands;
 class AudioSessionController;
-class Browser;
+class ChromeBrowserState;
 class VoiceSearchController;
 
 // VoiceSearchProvider allows embedders to provide functionality related to
@@ -35,7 +35,7 @@ class VoiceSearchProvider {
 
   // Creates a new VoiceSearchController object.
   virtual scoped_refptr<VoiceSearchController> CreateVoiceSearchController(
-      Browser* browser) const;
+      ChromeBrowserState* browser_state) const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VoiceSearchProvider);

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

@@ -23,6 +23,7 @@ AudioSessionController* VoiceSearchProvider::GetAudioSessionController() const {
 }
 
 scoped_refptr<VoiceSearchController>
-VoiceSearchProvider::CreateVoiceSearchController(Browser* browser) const {
+VoiceSearchProvider::CreateVoiceSearchController(
+    ChromeBrowserState* browser_state) const {
   return scoped_refptr<VoiceSearchController>(nullptr);
 }