Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

content/browser/frame_host/navigation_request.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/frame_host/navigation_request.h"
 
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
 #include "content/browser/frame_host/navigation_handle_impl.h"
@@ skipping 140 matching lines @@
     const NavigationEntryImpl* entry)
     : frame_tree_node_(frame_tree_node),
       common_params_(common_params),
       begin_params_(begin_params),
       request_params_(request_params),
       browser_initiated_(browser_initiated),
       state_(NOT_STARTED),
       restore_type_(NavigationEntryImpl::RESTORE_NONE),
       is_view_source_(false),
       bindings_(NavigationEntryImpl::kInvalidBindings) {
-  DCHECK(!browser_initiated || (entry != nullptr && frame_entry != nullptr));
+  DCHECK_IMPLIES(browser_initiated, entry != nullptr && frame_entry != nullptr);
   if (browser_initiated) {
     // TODO(clamy): use the FrameNavigationEntry for the source SiteInstance
     // once it has been moved from the NavigationEntry.
     source_site_instance_ = entry->source_site_instance();
     dest_site_instance_ = frame_entry->site_instance();
     restore_type_ = entry->restore_type();
     is_view_source_ = entry->IsViewSourceMode();
     bindings_ = entry->bindings();
   } else {
     // This is needed to have about:blank and data URLs commit in the same
@@ skipping 121 matching lines @@
   if (result == NavigationThrottle::CANCEL_AND_IGNORE) {
     frame_tree_node_->ResetNavigationRequest(false);
     return;
   }
 
   loader_->FollowRedirect();
   navigation_handle_->DidRedirectNavigation(common_params_.url);
 }
 
 }  // namespace content