Adding new test for mount observer. Also changing the usb mounter to only rel...

chrome/browser/chromeos/usb_mount_observer.cc

Index: chrome/browser/chromeos/usb_mount_observer.cc
===================================================================
--- chrome/browser/chromeos/usb_mount_observer.cc	(revision 42629)
+++ chrome/browser/chromeos/usb_mount_observer.cc	(working copy)
@@ -76,8 +76,8 @@
               TabContents* tab = iter->browser->GetSelectedTabContents();
               tab->OpenURL(GURL(url), GURL(), CURRENT_TAB,
                   PageTransition::LINK);
+              tab->NavigateToPendingEntry(NavigationController::RELOAD);
               iter->device_path = path;
-              iter->browser->Reload();
             } else {
               OpenFileBrowse(disks[i].mount_path, disks[i].device_path);
             }