[ObjC ARC] Converts ios/chrome/browser/ui/history:eg_tests to ARC.

ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.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/public/provider/chrome/browser/signin/fake_chrome_identity_service.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/mac/scoped_block.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 192 matching lines @@
   if (callback) {
     // Forgetting an identity is normally an asynchronous operation (that
     // require some network calls), this is replicated here by dispatching
     // it.
     dispatch_async(dispatch_get_main_queue(), ^{
       callback(nil);
     });
   }
 }
 
+UIImage* FakeChromeIdentityService::GetCachedAvatarForIdentity(
+    ChromeIdentity* identity) {
+  return FakeGetCachedAvatarForIdentity(identity);
+}
+
 void FakeChromeIdentityService::SetUpForIntegrationTests() {
   ON_CALL(*this, GetAccessToken(_, _, _, _, _))
       .WillByDefault(Invoke(FakeGetAccessToken));
 
   ON_CALL(*this, GetAvatarForIdentity(_, _))
       .WillByDefault(Invoke(FakeGetAvatarForIdentity));
 
-  ON_CALL(*this, GetCachedAvatarForIdentity(_))
-      .WillByDefault(Invoke(FakeGetCachedAvatarForIdentity));
-
   ON_CALL(*this, GetHostedDomainForIdentity(_, _))
       .WillByDefault(Invoke(FakeGetHostedDomainForIdentity));
 }
 
 void FakeChromeIdentityService::AddIdentities(NSArray* identitiesNames) {
   for (NSString* name in identitiesNames) {
     NSString* email = [NSString stringWithFormat:kIdentityEmailFormat, name];
     NSString* gaiaID = [NSString stringWithFormat:kIdentityGaiaIDFormat, name];
     [identities_ addObject:[FakeChromeIdentity identityWithEmail:email
                                                           gaiaID:gaiaID
                                                             name:name]];
   }
 }
 
 void FakeChromeIdentityService::AddIdentity(ChromeIdentity* identity) {
   [identities_ addObject:identity];
   FireIdentityListChanged();
 }
 
 }  // namespace ios