[cros] OOBE: add histograms for Profile image fetching.

chrome/browser/chromeos/login/profile_image_downloader.cc

Index: chrome/browser/chromeos/login/profile_image_downloader.cc
diff --git a/chrome/browser/chromeos/login/profile_image_downloader.cc b/chrome/browser/chromeos/login/profile_image_downloader.cc
index 0a6b9cc981b6e8d60b2b16c48c2f26f2792e85f0..827d16152ee485e7c25f18a52c402010e1e605dc 100644
--- a/chrome/browser/chromeos/login/profile_image_downloader.cc
+++ b/chrome/browser/chromeos/login/profile_image_downloader.cc
@@ -153,17 +153,14 @@ void ProfileImageDownloader::StartFetchingImage() {
 
 ProfileImageDownloader::~ProfileImageDownloader() {}
 
-void ProfileImageDownloader::OnURLFetchComplete(
-    const URLFetcher* source,
-    const GURL& url,
-    const net::URLRequestStatus& status,
-    int response_code,
-    const net::ResponseCookies& cookies,
-    const std::string& data) {
+void ProfileImageDownloader::OnURLFetchComplete(const URLFetcher* source) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  if (response_code != 200) {
-    LOG(ERROR) << "Response code is " << response_code;
-    LOG(ERROR) << "Url is " << url.spec();
+
+  const std::string& data = source->GetResponseStringRef();
+
+  if (source->response_code() != 200) {
+    LOG(ERROR) << "Response code is " << source->response_code();
+    LOG(ERROR) << "Url is " << source->url().spec();
     LOG(ERROR) << "Data is " << data;
     if (delegate_)
       delegate_->OnDownloadFailure();