base: Remove the string logging from CHECK().

content/test/content_browser_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/content_browser_sanity_checker.h"
 
 #include "base/bind.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/test/web_contents_observer_sanity_checker.h"
 
 namespace content {
 
 namespace {
 bool g_sanity_checks_already_enabled = false;
 }
 
 ContentBrowserSanityChecker::ContentBrowserSanityChecker() {
-  CHECK(!g_sanity_checks_already_enabled)
-      << "Tried to enable ContentBrowserSanityChecker, but it's already been "
-      << "enabled.";
+  // Tried to enable ContentBrowserSanityChecker, but it's already been enabled.
+  CHECK(!g_sanity_checks_already_enabled);
   g_sanity_checks_already_enabled = true;
 
   creation_hook_ =
       base::Bind(&ContentBrowserSanityChecker::OnWebContentsCreated,
                  base::Unretained(this));
   WebContentsImpl::FriendZone::AddCreatedCallbackForTesting(creation_hook_);
 }
 
 ContentBrowserSanityChecker::~ContentBrowserSanityChecker() {
   WebContentsImpl::FriendZone::RemoveCreatedCallbackForTesting(creation_hook_);
   g_sanity_checks_already_enabled = false;
 }
 
 void ContentBrowserSanityChecker::OnWebContentsCreated(
     WebContents* web_contents) {
   WebContentsObserverSanityChecker::Enable(web_contents);
 }
 
 }  // namespace content