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

chrome/browser/devtools/chrome_devtools_manager_delegate.h

Index: chrome/browser/devtools/chrome_devtools_manager_delegate.h
diff --git a/chrome/browser/devtools/chrome_devtools_manager_delegate.h b/chrome/browser/devtools/chrome_devtools_manager_delegate.h
index 123b6d74181166c13f4ea8d71d5ee811f81fc262..036b13477d3b490aea3c4dd060f8174e8c7471e1 100644
--- a/chrome/browser/devtools/chrome_devtools_manager_delegate.h
+++ b/chrome/browser/devtools/chrome_devtools_manager_delegate.h
@@ -33,6 +33,8 @@ class ChromeDevToolsManagerDelegate : public content::DevToolsManagerDelegate {
   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<DevToolsNetworkProtocolHandler> network_protocol_handler_;