[ios] Removed unused CRWWebControllerObserver methods.

ios/web/web_state/web_controller_observer_bridge.mm

 // Copyright 2014 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/web/web_state/web_controller_observer_bridge.h"
 
-#include "base/bind.h"
 #include "base/logging.h"
-#include "base/strings/sys_string_conversions.h"
 #import "ios/web/public/web_state/crw_web_controller_observer.h"
-#include "ios/web/public/web_state/web_state.h"
 
 namespace web {
 
 WebControllerObserverBridge::WebControllerObserverBridge(
     id<CRWWebControllerObserver> web_controller_observer,
     WebState* web_state,
     CRWWebController* web_controller)
     : WebStateObserver(web_state),
       web_controller_observer_(web_controller_observer),
       web_controller_(web_controller) {
   DCHECK(web_controller_observer_);
   DCHECK(web_controller_);
-
-  // Listen for script commands if needed.
-  if ([web_controller_observer_ respondsToSelector:@selector(commandPrefix)]) {
-    NSString* prefix = [web_controller_observer_ commandPrefix];
-    DCHECK_GT([prefix length], 0u);
-    script_command_callback_prefix_ = base::SysNSStringToUTF8(prefix);
-    web_state->AddScriptCommandCallback(
-        base::Bind(&WebControllerObserverBridge::ScriptCommandReceived,
-                   base::Unretained(this)),
-        script_command_callback_prefix_);
-  }
 }
 
 WebControllerObserverBridge::~WebControllerObserverBridge() {
-  if (!script_command_callback_prefix_.empty())
-    web_state()->RemoveScriptCommandCallback(script_command_callback_prefix_);
 }
 
 void WebControllerObserverBridge::PageLoaded(
     PageLoadCompletionStatus load_completion_status) {
   if (load_completion_status == PageLoadCompletionStatus::SUCCESS &&
       [web_controller_observer_ respondsToSelector:@selector(pageLoaded:)])
     [web_controller_observer_ pageLoaded:web_controller_];
 }
 
-bool WebControllerObserverBridge::ScriptCommandReceived(
-    const base::DictionaryValue& value,
-    const GURL& url,
-    bool user_is_interacting) {
-  DCHECK(!script_command_callback_prefix_.empty());
-  return [web_controller_observer_ handleCommand:value
-                                   webController:web_controller_
-                               userIsInteracting:user_is_interacting
-                                       originURL:url];
-}
-
 }  // namespace web