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

components/ui_devtools/string_util.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 COMPONENTS_UI_DEVTOOLS_STRING_UTIL_H_
 #define COMPONENTS_UI_DEVTOOLS_STRING_UTIL_H_
 
 #include <memory>
 
 #include "base/json/json_reader.h"
@@ skipping 10 matching lines @@
 
 class CustomStringBuilder {
   String s_;
 
  public:
   CustomStringBuilder() {}
   CustomStringBuilder(String& s) : s_(s) {}
   void reserveCapacity(std::size_t size) { s_.reserve(size); }
   void append(const String& s) { s_ += s; }
   void append(char c) { s_ += c; }
-  void append(const char* data, unsigned int length) {
-    s_.append(data, length);
-  }
+  void append(const char* data, size_t length) { s_.append(data, length); }
   String toString() { return s_; }
 };
 
 using StringBuilder = CustomStringBuilder;
 
 class StringUtil {
  public:
   static String substring(const String& s, unsigned pos, unsigned len) {
     return s.substr(pos, len);
   }
@@ skipping 29 matching lines @@
   }
   static const size_t kNotFound = static_cast<size_t>(-1);
   static std::unique_ptr<Value> parseJSON(const String& string);
 };
 
 }  // namespace protocol
 }  // namespace devtools
 }  // namespace ui
 
 #endif  // COMPONENTS_UI_DEVTOOLS_STRING_UTIL_H_