[iOS] Remove cast service init API from provider.

There is no longer a cast service to initialize, so the cast service
init can be removed from the provider. This also removes use of TabModel
in the provider API.

Change-Id: If618ff507104bfdd41d38b01cd9ec7087a7e66e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1960450
Commit-Queue: Mark Cogan <marq@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Mark Cogan <marq@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723388}

ios/chrome/browser/ui/main/browser_view_wrangler.mm

@@ -22,7 +22,6 @@
 #import "ios/chrome/browser/web_state_list/active_web_state_observation_forwarder.h"
 #import "ios/chrome/browser/web_state_list/web_state_list.h"
 #import "ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h"
-#include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #import "ios/web/public/web_state.h"
 #import "ios/web/public/web_state_observer_bridge.h"
 
@@ -187,8 +186,6 @@
   // Follow loaded URLs in the main tab model to send those in case of
   // crashes.
   breakpad::MonitorURLsForWebStateList(self.mainBrowser->GetWebStateList());
-  ios::GetChromeBrowserProvider()->InitializeCastService(
-      self.mainBrowser->GetTabModel());
 
   // Create the main coordinator, and thus the main interface.
   _mainBrowserCoordinator = [self coordinatorForBrowser:self.mainBrowser];

ios/public/provider/chrome/browser/chrome_browser_provider.h

@@ -38,7 +38,6 @@ class WebState;
 
 class GURL;
 @protocol LogoVendor;
-@class TabModel;
 @class UITextField;
 @class UIView;
 
@@ -118,10 +117,6 @@ class ChromeBrowserProvider {
   virtual bool ShouldBlockUrlDuringRestore(const GURL& url,
                                            web::WebState* web_state);
 
-  // Initializes the cast service.  Should be called soon after the given
-  // |main_tab_model| is created.
-  virtual void InitializeCastService(TabModel* main_tab_model) const;
-
   // Attaches any embedder-specific tab helpers to the given |web_state|.
   virtual void AttachTabHelpers(web::WebState* web_state) const;
 

ios/public/provider/chrome/browser/chrome_browser_provider.mm

@@ -82,9 +82,6 @@ UITextField* ChromeBrowserProvider::CreateStyledTextField() const {
   return nil;
 }
 
-void ChromeBrowserProvider::InitializeCastService(
-    TabModel* main_tab_model) const {}
-
 void ChromeBrowserProvider::AttachTabHelpers(web::WebState* web_state) const {}
 
 VoiceSearchProvider* ChromeBrowserProvider::GetVoiceSearchProvider() const {