Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

content/test/web_contents_observer_sanity_checker.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/test/web_contents_observer_sanity_checker.h"
 
 #include "base/strings/stringprintf.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/common/frame_messages.h"
 #include "content/public/browser/navigation_handle.h"
@@ skipping 139 matching lines @@
   CHECK(!navigation_handle->HasCommitted());
   CHECK(navigation_handle->GetRenderFrameHost());
   CHECK_EQ(navigation_handle->GetWebContents(), web_contents());
   CHECK(navigation_handle->GetRenderFrameHost() != nullptr);
 }
 
 void WebContentsObserverSanityChecker::DidFinishNavigation(
     NavigationHandle* navigation_handle) {
   CHECK(NavigationIsOngoing(navigation_handle));
 
-  CHECK(!(navigation_handle->HasCommitted() &&
-          !navigation_handle->IsErrorPage()) ||
-        navigation_handle->GetNetErrorCode() == net::OK);
-  CHECK(!(navigation_handle->HasCommitted() &&
-          navigation_handle->IsErrorPage()) ||
-        navigation_handle->GetNetErrorCode() != net::OK);
+  CHECK_IMPLIES(
+      navigation_handle->HasCommitted() && !navigation_handle->IsErrorPage(),
+      navigation_handle->GetNetErrorCode() == net::OK);
+  CHECK_IMPLIES(
+      navigation_handle->HasCommitted() && navigation_handle->IsErrorPage(),
+      navigation_handle->GetNetErrorCode() != net::OK);
   CHECK_EQ(navigation_handle->GetWebContents(), web_contents());
 
-  CHECK(!navigation_handle->HasCommitted() ||
-        navigation_handle->GetRenderFrameHost() != nullptr);
+  CHECK_IMPLIES(navigation_handle->HasCommitted(),
+                navigation_handle->GetRenderFrameHost() != nullptr);
 
   ongoing_navigations_.erase(navigation_handle);
 }
 
 void WebContentsObserverSanityChecker::DidStartProvisionalLoadForFrame(
     RenderFrameHost* render_frame_host,
     const GURL& validated_url,
     bool is_error_page,
     bool is_iframe_srcdoc) {
   AssertRenderFrameExists(render_frame_host);
@@ skipping 139 matching lines @@
       render_frame_host->GetSiteInstance()->GetSiteURL().spec().c_str());
 }
 
 bool WebContentsObserverSanityChecker::NavigationIsOngoing(
     NavigationHandle* navigation_handle) {
   auto it = ongoing_navigations_.find(navigation_handle);
   return it != ongoing_navigations_.end();
 }
 
 }  // namespace content