Disable TabposeWindowTest.TestModelObserver on 10.7. It crashes flakily.

chrome/browser/ui/cocoa/tabpose_window_unittest.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/tabpose_window.h"
 
 #include "base/mac/mac_util.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
@@ skipping 45 matching lines @@
       [TabposeWindow openTabposeFor:parent
                                rect:NSMakeRect(10, 20, 250, 160)
                               slomo:NO
                       tabStripModel:browser()->tab_strip_model()];
 
   // Should release the window.
   [window mouseDown:nil];
 }
 
 TEST_F(TabposeWindowTest, TestModelObserver) {
+  // Skip this test on 10.7
+  // http://code.google.com/p/chromium/issues/detail?id=127845
+  if (base::mac::IsOSLionOrLater()) {
+    return;
+  }
+
   NSWindow* parent = browser()->window()->GetNativeWindow();
   [parent orderFront:nil];
 
   // Add a few tabs to the tab strip model.
   for (int i = 0; i < 3; ++i)
     AppendTabToStrip();
 
   base::mac::ScopedNSAutoreleasePool pool;
   TabposeWindow* window =
       [TabposeWindow openTabposeFor:parent
@@ skipping 36 matching lines @@
   DCHECK_EQ([window selectedIndex], 0);
 
   [window selectTileAtIndexWithoutAnimation:1];
   model->CloseTabContentsAt(0, TabStripModel::CLOSE_NONE);
   DCHECK_EQ([window thumbnailLayerCount], 1u);
   DCHECK_EQ([window selectedIndex], 0);
 
   // Should release the window.
   [window mouseDown:nil];
 }