Revert of Remove the is_loading_ field from WebContentsImpl

content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc

 // 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.
 
 #include "content/browser/web_contents/aura/overscroll_navigation_overlay.h"
 
 #include <string.h>
 #include <utility>
 #include <vector>
 
@@ skipping 289 matching lines @@
 // Tests that an overscroll navigation that receives a loading update actually
 // stops observing.
 TEST_F(OverscrollNavigationOverlayTest, Navigation_LoadingUpdate) {
   PerformBackNavigationViaSliderCallbacks();
   EXPECT_TRUE(GetOverlay()->web_contents());
   // DidStopLoading for any navigation should always reset the load flag and
   // dismiss the overlay even if the pending navigation wasn't committed -
   // this is a "safety net" in case we mis-identify the destination webpage
   // (which can happen if a new navigation is performed while while a GestureNav
   // navigation is in progress).
+  contents()->TestSetIsLoading(true);
   contents()->TestSetIsLoading(false);
   EXPECT_FALSE(GetOverlay()->web_contents());
   NavigationEntry* pending = contents()->GetController().GetPendingEntry();
   contents()->GetPendingMainFrame()->SendNavigate(
       pending->GetPageID(), pending->GetUniqueID(), false, pending->GetURL());
   EXPECT_EQ(contents()->GetURL(), third());
 }
 
 TEST_F(OverscrollNavigationOverlayTest, CloseDuringAnimation) {
   ui::ScopedAnimationDurationScaleMode normal_duration_(
@@ skipping 84 matching lines @@
   EXPECT_TRUE(GetOverlay()->window_.get());
 
   // Load the page.
   contents()->CommitPendingNavigation();
   ReceivePaintUpdate();
   EXPECT_FALSE(GetOverlay()->window_.get());
   EXPECT_EQ(contents()->GetURL(), first());
 }
 
 }  // namespace content