Hopefully make DownloadTest.UnknownSize not-flaky.

chrome/test/ui/ui_test.cc

Index: chrome/test/ui/ui_test.cc
===================================================================
--- chrome/test/ui/ui_test.cc	(revision 11375)
+++ chrome/test/ui/ui_test.cc	(working copy)
@@ -498,14 +498,14 @@
 bool UITest::WaitForDownloadShelfVisible(TabProxy* tab) {
   const int kCycles = 20;
   for (int i = 0; i < kCycles; i++) {
+    // Give it a chance to catch up.
+    PlatformThread::Sleep(action_max_timeout_ms() / kCycles);
+
     bool visible = false;
     if (!tab->IsShelfVisible(&visible))
-      return false;  // Some error.
+      continue;
     if (visible)
       return true;  // Got the download shelf.
-
-    // Give it a chance to catch up.
-    PlatformThread::Sleep(action_max_timeout_ms() / kCycles);
   }
   return false;
 }