base: Remove the string logging from CHECK().

content/browser/frame_host/navigation_controller_impl.cc

 // Copyright 2013 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.
 
 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  *     (http://www.torchmobile.com/)
  *
@@ skipping 1575 matching lines @@
     return;
 
   // We can't overwrite an existing SessionStorage without violating spec.
   // Attempts to do so may give a tab access to another tab's session storage
   // so die hard on an error.
   bool successful_insert = session_storage_namespace_map_.insert(
       make_pair(partition_id,
                 static_cast<SessionStorageNamespaceImpl*>(
                     session_storage_namespace)))
           .second;
-  CHECK(successful_insert) << "Cannot replace existing SessionStorageNamespace";
+  // Cannot replace existing SessionStorageNamespace
+  CHECK(successful_insert);
 }
 
 bool NavigationControllerImpl::IsUnmodifiedBlankTab() const {
   return IsInitialNavigation() &&
          !GetLastCommittedEntry() &&
          !delegate_->HasAccessedInitialDocument();
 }
 
 SessionStorageNamespace*
 NavigationControllerImpl::GetSessionStorageNamespace(SiteInstance* instance) {
@@ skipping 470 matching lines @@
     }
   }
 }
 
 void NavigationControllerImpl::SetGetTimestampCallbackForTest(
     const base::Callback<base::Time()>& get_timestamp_callback) {
   get_timestamp_callback_ = get_timestamp_callback;
 }
 
 }  // namespace content