Don't compile code for desktop zoom or GuestViews on mobile platforms.

android_webview/browser/aw_browser_context.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 "android_webview/browser/aw_browser_context.h"
 
 #include <utility>
 
 #include "android_webview/browser/aw_browser_policy_connector.h"
 #include "android_webview/browser/aw_form_database_service.h"
@@ skipping 251 matching lines @@
           browser_policy_connector_->GetPolicyService(),
           browser_policy_connector_->GetHandlerList(),
           policy::POLICY_LEVEL_MANDATORY)));
   pref_service_factory.set_read_error_callback(base::Bind(&HandleReadError));
   user_pref_service_ = pref_service_factory.Create(pref_registry);
   pref_change_registrar_.Init(user_pref_service_.get());
 
   user_prefs::UserPrefs::Set(this, user_pref_service_.get());
 }
 
-std::unique_ptr<content::ZoomLevelDelegate>
-AwBrowserContext::CreateZoomLevelDelegate(
-    const base::FilePath& partition_path) {
-  return nullptr;
-}
-
 base::FilePath AwBrowserContext::GetPath() const {
   return context_storage_path_;
 }
 
 bool AwBrowserContext::IsOffTheRecord() const {
   // Android WebView does not support off the record profile yet.
   return false;
 }
 
 content::ResourceContext* AwBrowserContext::GetResourceContext() {
@@ skipping 110 matching lines @@
 
 void AwBrowserContext::RebuildTable(
     const scoped_refptr<URLEnumerator>& enumerator) {
   // Android WebView rebuilds from WebChromeClient.getVisitedHistory. The client
   // can change in the lifetime of this WebView and may not yet be set here.
   // Therefore this initialization path is not used.
   enumerator->OnComplete(true);
 }
 
 }  // namespace android_webview