[ios] Removed unused CRWWebControllerObserver methods.

ios/web/test/crw_fake_web_controller_observer.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/test/crw_fake_web_controller_observer.h"
 
-#import "base/logging.h"
-#import "base/mac/scoped_nsobject.h"
-#include "base/values.h"
-
-@implementation CRWFakeWebControllerObserver {
-  ScopedVector<base::DictionaryValue> _commandsReceived;
-  base::scoped_nsobject<NSString> _commandPrefix;
-}
+@implementation CRWFakeWebControllerObserver
 
 @synthesize pageLoaded = _pageLoaded;
 
-- (instancetype)initWithCommandPrefix:(NSString*)commandPrefix {
-  DCHECK(commandPrefix);
-  self = [super init];
-  if (self) {
-    _commandPrefix.reset([commandPrefix copy]);
-  }
-  return self;
-}
-
-- (instancetype)init {
-  NOTREACHED();
-  return nil;
-}
-
 - (void)pageLoaded:(CRWWebController*)webController {
   _pageLoaded = YES;
 }
 
-- (NSString*)commandPrefix {
-  return _commandPrefix;
-}
-
-- (BOOL)handleCommand:(const base::DictionaryValue&)command
-        webController:(CRWWebController*)webController
-    userIsInteracting:(BOOL)userIsInteracting
-            originURL:(const GURL&)originURL {
-  _commandsReceived.push_back(command.DeepCopy());
-  return YES;
-}
-
-- (ScopedVector<base::DictionaryValue>&)commandsReceived {
-  return _commandsReceived;
-}
-
 @end