Disable DownloadTest.UnknownSize because it is flaky.

chrome/browser/download/download_uitest.cc

Index: chrome/browser/download/download_uitest.cc
===================================================================
--- chrome/browser/download/download_uitest.cc	(revision 8877)
+++ chrome/browser/download/download_uitest.cc	(working copy)
@@ -228,7 +228,8 @@
 // The test will first attempt to download a file; but the server will "pause"
 // in the middle until the server receives a second request for
 // "download-finish.  At that time, the download will finish.
-TEST_F(DownloadTest, UnknownSize) {
+// TODO(paul): Reenable, http://code.google.com/p/chromium/issues/detail?id=7191
+TEST_F(DownloadTest, DISABLED_UnknownSize) {
   std::wstring url(URLRequestSlowDownloadJob::kUnknownSizeUrl);
   std::wstring filename = file_util::GetFilenameFromPath(url);
   RunSizeTest(url, L"32.0 KB - " + filename, L"100% - " + filename);