[DevTools] Migrate android to devtools_discovery.

android_webview/browser/aw_dev_tools_discovery_provider.h

 // Copyright 2015 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.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_AW_DEV_TOOLS_DISCOVERY_PROVIDER_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_DEV_TOOLS_DISCOVERY_PROVIDER_H_
 
 #include "components/devtools_discovery/devtools_discovery_manager.h"
 
 namespace android_webview {
 
 class AwDevToolsDiscoveryProvider :
     public devtools_discovery::DevToolsDiscoveryManager::Provider {
  public:
-  AwDevToolsDiscoveryProvider();
+  // Installs provider to devtools_discovery.
+  static void Install();
+
   ~AwDevToolsDiscoveryProvider() override;
 
   // devtools_discovery::DevToolsDiscoveryManager::Provider implementation.
   devtools_discovery::DevToolsTargetDescriptor::List GetDescriptors() override;
 
  private:
+  AwDevToolsDiscoveryProvider();
+
   DISALLOW_COPY_AND_ASSIGN(AwDevToolsDiscoveryProvider);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_DEV_TOOLS_DISCOVERY_PROVIDER_H_