[ios] Adds a CommandDispatcher to Browser.

ios/clean/chrome/browser/model/browser.mm

Index: ios/clean/chrome/browser/model/browser.mm
diff --git a/ios/clean/chrome/browser/model/browser.mm b/ios/clean/chrome/browser/model/browser.mm
index 8724e3eb61d8685bf4bfce4ad1b012c044b1273b..269d6aeef1d2c8f347ab143496db258444af2e1f 100644
--- a/ios/clean/chrome/browser/model/browser.mm
+++ b/ios/clean/chrome/browser/model/browser.mm
@@ -7,6 +7,7 @@
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #import "ios/clean/chrome/browser/model/browser_web_state_list_delegate.h"
+#import "ios/clean/chrome/browser/ui/commands/command_dispatcher.h"
 #import "ios/shared/chrome/browser/tabs/web_state_list.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -14,7 +15,8 @@
 #endif
 
 Browser::Browser(ios::ChromeBrowserState* browser_state)
-    : browser_state_(browser_state) {
+    : dispatcher_([[CommandDispatcher alloc] init]),
+      browser_state_(browser_state) {
   DCHECK(browser_state_);
   web_state_list_delegate_ =
       base::MakeUnique<BrowserWebStateListDelegate>(this);