[ios] Adds support for Find in Page to the new architecture.

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 ede26f6aabfc7b985ebb6270ce5e1b61130976da..ba0ea80155eb4be89bc2ea31094d1ea17e5ce07f 100644
--- a/ios/clean/chrome/browser/model/browser.mm
+++ b/ios/clean/chrome/browser/model/browser.mm
@@ -5,6 +5,7 @@
 #import "ios/clean/chrome/browser/model/browser.h"
 
 #include "base/logging.h"
+#import "ios/clean/chrome/browser/ui/commands/command_dispatcher.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ -12,6 +13,7 @@
 
 Browser::Browser(ios::ChromeBrowserState* browser_state)
     : web_state_list_(WebStateList::WebStateOwned),
+      dispatcher_([[CommandDispatcher alloc] init]),
       browser_state_(browser_state) {
   DCHECK(browser_state_);
 }