DevTools: merge devtools_http_handler into content - it is used in all the embedders anyways.

components/devtools_http_handler/devtools_http_handler_delegate.h

-// 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.
-
-#ifndef COMPONENTS_DEVTOOLS_HTTP_HANDLER_DEVTOOLS_HTTP_HANDLER_DELEGATE_H_
-#define COMPONENTS_DEVTOOLS_HTTP_HANDLER_DEVTOOLS_HTTP_HANDLER_DELEGATE_H_
-
-#include <string>
-
-#include "url/gurl.h"
-
-namespace content {
-class DevToolsExternalAgentProxyDelegate;
-}
-
-namespace devtools_http_handler {
-
-class DevToolsHttpHandlerDelegate {
- public:
-  virtual ~DevToolsHttpHandlerDelegate() {}
-
-  // Should return discovery page HTML that should list available tabs
-  // and provide attach links.
-  virtual std::string GetDiscoveryPageHTML() = 0;
-
-  // Returns frontend resource data by |path|. Only used if
-  // |BundlesFrontendResources| returns |true|.
-  virtual std::string GetFrontendResource(const std::string& path) = 0;
-};
-
-}  // namespace devtools_http_handler
-
-#endif  // COMPONENTS_DEVTOOLS_HTTP_HANDLER_DEVTOOLS_HTTP_HANDLER_DELEGATE_H_