Move DevTools out of ash and turn it to a component.

components/ui_devtools/devtools_server.h

Index: components/ui_devtools/devtools_server.h
diff --git a/components/ui_devtools/devtools_server.h b/components/ui_devtools/devtools_server.h
index 04483cc899c75fe3fa3a5ed3798828db6322e7dd..7a77be09090c24bcf855a421f1f76442506154a9 100644
--- a/components/ui_devtools/devtools_server.h
+++ b/components/ui_devtools/devtools_server.h
@@ -14,13 +14,15 @@
 #include "components/ui_devtools/Forward.h"
 #include "components/ui_devtools/Protocol.h"
 #include "components/ui_devtools/devtools_client.h"
+#include "components/ui_devtools/devtools_export.h"
 #include "components/ui_devtools/string_util.h"
 #include "net/server/http_server.h"
 
 namespace ui {
 namespace devtools {
 
-class UiDevToolsServer : public net::HttpServer::Delegate {
+class UI_DEVTOOLS_EXPORT UiDevToolsServer
+    : public NON_EXPORTED_BASE(net::HttpServer::Delegate) {
  public:
   ~UiDevToolsServer() override;