Don't send a reference to a string that goes out of scope.

chrome/common/net/url_fetcher.h

Index: chrome/common/net/url_fetcher.h
diff --git a/chrome/common/net/url_fetcher.h b/chrome/common/net/url_fetcher.h
index c3cf868d78e4fae619969f2b11eaed0dd7d10c0a..3abc1ea1fa9b0da3496e2ed424e9505f47e8c65c 100644
--- a/chrome/common/net/url_fetcher.h
+++ b/chrome/common/net/url_fetcher.h
@@ -269,6 +269,12 @@ class URLFetcher {
   // Used by tests.
   const std::string& upload_data() const;
 
+  // Return a reference to the string data fetched.  Response type must
+  // be STRING, or this will CHECK.  This method exists to support the
+  // old signiture to OnURLFetchComplete(), and will be removed as part
+  // of crbug.com/83592 .
+  const std::string& GetResponseStringRef() const;
+
  private:
   friend class URLFetcherTest;
   friend class TestURLFetcher;