[ios clean] Move dispatcher out of Browser.

ios/clean/chrome/browser/ui/tab/tab_coordinator.mm

 // Copyright 2016 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.
 
 #import "ios/clean/chrome/browser/ui/tab/tab_coordinator.h"
 
 #include <memory>
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
@@ skipping 42 matching lines @@
   self.viewController.transitioningDelegate = self;
   self.viewController.modalPresentationStyle = UIModalPresentationCustom;
   _webStateObserver =
       base::MakeUnique<web::WebStateObserverBridge>(self.webState, self);
 
   [self.browser->broadcaster()
       broadcastValue:@"tabStripVisible"
             ofObject:self.viewController
             selector:@selector(broadcastTabStripVisible:)];
 
-  CommandDispatcher* dispatcher = self.browser->dispatcher();
   // TabCommands
-  [dispatcher startDispatchingToTarget:self forSelector:@selector(loadURL:)];
+  [self.dispatcher startDispatchingToTarget:self
+                                forSelector:@selector(loadURL:)];
 
   WebCoordinator* webCoordinator = [[WebCoordinator alloc] init];
   webCoordinator.webState = self.webState;
   [self addChildCoordinator:webCoordinator];
   [webCoordinator start];
   self.webCoordinator = webCoordinator;
 
   ToolbarCoordinator* toolbarCoordinator = [[ToolbarCoordinator alloc] init];
   toolbarCoordinator.webState = self.webState;
   [self addChildCoordinator:toolbarCoordinator];
@@ skipping 22 matching lines @@
 }
 
 - (void)stop {
   [super stop];
   for (BrowserCoordinator* child in self.children) {
     [self removeChildCoordinator:child];
   }
   [self.browser->broadcaster()
       stopBroadcastingForSelector:@selector(broadcastTabStripVisible:)];
   _webStateObserver.reset();
-  [self.browser->dispatcher() stopDispatchingToTarget:self];
+  [self.dispatcher stopDispatchingToTarget:self];
 }
 
 - (void)childCoordinatorDidStart:(BrowserCoordinator*)childCoordinator {
   if ([childCoordinator isKindOfClass:[ToolbarCoordinator class]]) {
     self.viewController.toolbarViewController = childCoordinator.viewController;
   } else if ([childCoordinator isKindOfClass:[WebCoordinator class]] ||
              [childCoordinator isKindOfClass:[NTPCoordinator class]]) {
     self.viewController.contentViewController = childCoordinator.viewController;
   } else if ([childCoordinator isKindOfClass:[TabStripCoordinator class]]) {
     self.viewController.tabStripViewController =
@@ skipping 82 matching lines @@
   return animator;
 }
 
 #pragma mark - TabCommands
 
 - (void)loadURL:(web::NavigationManager::WebLoadParams)params {
   self.webState->GetNavigationManager()->LoadURLWithParams(params);
 }
 
 @end