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

chrome/browser/devtools/remote_debugging_server.h

Index: chrome/browser/devtools/remote_debugging_server.h
diff --git a/chrome/browser/devtools/remote_debugging_server.h b/chrome/browser/devtools/remote_debugging_server.h
index 9793a7b0941387b72d5e92519094a24c563fad3a..e2ba3e7844047d7ca1ed793488cf1b68c9bf372f 100644
--- a/chrome/browser/devtools/remote_debugging_server.h
+++ b/chrome/browser/devtools/remote_debugging_server.h
@@ -12,10 +12,6 @@
 
 #include "base/macros.h"
 
-namespace devtools_http_handler {
-class DevToolsHttpHandler;
-}
-
 class RemoteDebuggingServer {
  public:
   static void EnableTetheringForDebug();
@@ -26,8 +22,6 @@ class RemoteDebuggingServer {
   virtual ~RemoteDebuggingServer();
 
  private:
-  std::unique_ptr<devtools_http_handler::DevToolsHttpHandler>
-      devtools_http_handler_;
   DISALLOW_COPY_AND_ASSIGN(RemoteDebuggingServer);
 };