Don't allow elevation for CHROME_OS.

chrome/browser/managed_mode/managed_mode_navigation_observer.cc

 // Copyright (c) 2012 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 "chrome/browser/managed_mode/managed_mode_navigation_observer.h"
 
 #include "base/bind.h"
 #include "base/i18n/rtl.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 315 matching lines @@
   if (last_url_.is_valid()) {
     std::vector<std::string> hosts;
     hosts.push_back(last_url_.host());
     managed_user_service_->SetManualBehaviorForHosts(
         hosts, ManagedUserService::MANUAL_ALLOW);
   }
   ClearObserverState();
 }
 
 bool ManagedModeNavigationObserver::is_elevated() const {
+#if defined(OS_CHROMEOS)
+  return false;
+#else
   return is_elevated_;
+#endif
 }
 
 void ManagedModeNavigationObserver::set_elevated(bool is_elevated) {
+#if defined(OS_CHROMEOS)
+  NOTREACHED();
+#else
   is_elevated_ = is_elevated;
+#endif
 }
 
 void ManagedModeNavigationObserver::AddURLToPatternList(const GURL& url) {
   navigated_urls_.insert(url);
   last_url_ = url;
 }
 
 void ManagedModeNavigationObserver::SetStateToRecordingAfterPreview() {
   state_ = RECORDING_URLS_AFTER_PREVIEW;
 }
@@ skipping 167 matching lines @@
 
   if (behavior == ManagedModeURLFilter::BLOCK) {
     DCHECK_EQ(RECORDING_URLS_AFTER_PREVIEW, state_);
     // Add the infobar.
     if (!preview_infobar_delegate_) {
       preview_infobar_delegate_ = ManagedModePreviewInfobarDelegate::Create(
           InfoBarService::FromWebContents(web_contents()));
     }
   }
 }