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

ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.mm

Index: ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.mm
diff --git a/ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.mm b/ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.mm
index aeea097f4d90e1d353029f2ca74c7dc7bb9f0d10..f5678eabaa9274f12166cd22a1a7987b27cbb4e3 100644
--- a/ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.mm
+++ b/ios/public/provider/chrome/browser/signin/fake_chrome_identity_service.mm
@@ -210,6 +210,11 @@ void FakeChromeIdentityService::ForgetIdentity(
   }
 }
 
+UIImage* FakeChromeIdentityService::GetCachedAvatarForIdentity(
+    ChromeIdentity* identity) {
+  return FakeGetCachedAvatarForIdentity(identity);
+}
+
 void FakeChromeIdentityService::SetUpForIntegrationTests() {
   ON_CALL(*this, GetAccessToken(_, _, _, _, _))
       .WillByDefault(Invoke(FakeGetAccessToken));
@@ -217,9 +222,6 @@ void FakeChromeIdentityService::SetUpForIntegrationTests() {
   ON_CALL(*this, GetAvatarForIdentity(_, _))
       .WillByDefault(Invoke(FakeGetAvatarForIdentity));
 
-  ON_CALL(*this, GetCachedAvatarForIdentity(_))
-      .WillByDefault(Invoke(FakeGetCachedAvatarForIdentity));
-
   ON_CALL(*this, GetHostedDomainForIdentity(_, _))
       .WillByDefault(Invoke(FakeGetHostedDomainForIdentity));
 }