Re-land r93365 - add RefCountedString

chrome/browser/browser_about_handler.cc

Index: chrome/browser/browser_about_handler.cc
diff --git a/chrome/browser/browser_about_handler.cc b/chrome/browser/browser_about_handler.cc
index 6ee0a36083f92db35c6fd229b718dd0b5d7b9291..6ad5d2677f4bc24b998446b1b87bc8a8e7e668b5 100644
--- a/chrome/browser/browser_about_handler.cc
+++ b/chrome/browser/browser_about_handler.cc
@@ -1421,10 +1421,8 @@ void AboutSource::StartDataRequest(const std::string& path,
 }
 
 void AboutSource::FinishDataRequest(const std::string& html, int request_id) {
-  scoped_refptr<RefCountedBytes> html_bytes(new RefCountedBytes);
-  html_bytes->data.resize(html.size());
-  std::copy(html.begin(), html.end(), html_bytes->data.begin());
-  SendResponse(request_id, html_bytes);
+  std::string html_copy(html);
+  SendResponse(request_id, base::RefCountedString::TakeString(&html_copy));
 }
 
 std::string AboutSource::GetMimeType(const std::string& path) const {