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

headless/lib/browser/headless_devtools_manager_delegate.h

 // Copyright 2016 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 HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_MANAGER_DELEGATE_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_MANAGER_DELEGATE_H_
 
 #include "content/public/browser/devtools_manager_delegate.h"
 
 #include <map>
@@ skipping 18 matching lines @@
   // DevToolsManagerDelegate implementation:
   void Inspect(content::DevToolsAgentHost* agent_host) override {}
   void DevToolsAgentStateChanged(content::DevToolsAgentHost* agent_host,
                                  bool attached) override{};
   base::DictionaryValue* HandleCommand(content::DevToolsAgentHost* agent_host,
                                        base::DictionaryValue* command) override;
   std::string GetTargetType(content::RenderFrameHost* host) override;
   std::string GetTargetTitle(content::RenderFrameHost* host) override;
   scoped_refptr<content::DevToolsAgentHost> CreateNewTarget(
       const GURL& url) override;
+  std::string GetDiscoveryPageHTML() override;
+  std::string GetFrontendResource(const std::string& path) override;
 
  private:
   std::unique_ptr<base::Value> CreateTarget(
       const base::DictionaryValue* params);
   std::unique_ptr<base::Value> CloseTarget(const base::DictionaryValue* params);
   std::unique_ptr<base::Value> CreateBrowserContext(
       const base::DictionaryValue* params);
   std::unique_ptr<base::Value> DisposeBrowserContext(
       const base::DictionaryValue* params);
 
   base::WeakPtr<HeadlessBrowserImpl> browser_;
 
   using CommandMemberFnPtr = std::unique_ptr<base::Value> (
       HeadlessDevToolsManagerDelegate::*)(const base::DictionaryValue* params);
 
   std::map<std::string, CommandMemberFnPtr> command_map_;
 
   HeadlessBrowserContext* default_browser_context_;
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_DEVTOOLS_MANAGER_DELEGATE_H_