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

components/ui_devtools/string_util.cc

 // 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.
 
 #include "components/ui_devtools/string_util.h"
 
 #include "base/strings/string_util.h"
 #include "components/ui_devtools/Protocol.h"
 
-namespace ui {
-namespace devtools {
+namespace ui_devtools {
 namespace protocol {
 
 // static
 std::unique_ptr<Value> StringUtil::parseJSON(const String& string) {
   DCHECK(base::IsStringUTF8(string));
   // TODO(mhashmi): 16-bit strings need to be handled
   return parseJSONCharacters(reinterpret_cast<const uint8_t*>(&string[0]),
                              string.length());
 };
 
 }  // namespace protocol
-}  // namespace ws
-}  // namespace ui
+}  // namespace ui_devtools