Fix missing namespace for scoped_nsobject.

ios/chrome/browser/signin/gaia_auth_fetcher_ios_unittest.mm

 // Copyright 2015 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.
 
 #include "ios/chrome/browser/signin/gaia_auth_fetcher_ios.h"
 
 #include <memory>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/run_loop.h"
@@ skipping 18 matching lines @@
       : GaiaAuthFetcherIOSBridge(fetcher, browser_state), mock_web_view_(nil) {}
 
  private:
   WKWebView* BuildWKWebView() override {
     if (!mock_web_view_) {
       mock_web_view_.reset(
           [[OCMockObject niceMockForClass:[WKWebView class]] retain]);
     }
     return mock_web_view_;
   }
-  scoped_nsobject<id> mock_web_view_;
+  base::scoped_nsobject<id> mock_web_view_;
 };
 
 class MockGaiaConsumer : public GaiaAuthConsumer {
  public:
   MockGaiaConsumer() {}
   ~MockGaiaConsumer() {}
 
   MOCK_METHOD1(OnMergeSessionSuccess, void(const std::string& data));
   MOCK_METHOD1(OnClientLoginFailure, void(const GoogleServiceAuthError& error));
   MOCK_METHOD1(OnLogOutFailure, void(const GoogleServiceAuthError& error));
@@ skipping 134 matching lines @@
   [[GetMockWKWebView() expect] setNavigationDelegate:[OCMArg isNotNil]];
   [static_cast<WKWebView*>([[GetMockWKWebView() expect] andDo:^(NSInvocation*) {
     GetBridge()->URLFetchSuccess("data");
   }]) loadRequest:[OCMArg any]];
 
   gaia_auth_fetcher_->StartMergeSession("uber_token", "");
   web::BrowserState::GetActiveStateManager(&browser_state_)->SetActive(false);
   web::BrowserState::GetActiveStateManager(&browser_state_)->SetActive(true);
   EXPECT_OCMOCK_VERIFY(GetMockWKWebView());
 }