Try to mark ContextLost_WebGLContextLostFromGPUProcessExit flaky again.

content/test/gpu/gpu_tests/context_lost_expectations.py

 # Copyright 2014 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.
 
 from gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class ContextLostExpectations(GpuTestExpectations):
   def SetExpectations(self):
     # Sample Usage:
     # self.Fail('ContextLost_WebGLContextLostFromGPUProcessExit',
     #     ['mac', 'amd', ('nvidia', 0x1234)], bug=123)
 
     # AMD Radeon 6450
     self.Fail('ContextLost_WebGLContextLostFromGPUProcessExit',
         ['linux', ('amd', 0x6779)], bug=479975)
 
     # Win7 bots
-    # Related bug: http://crbug.com/603329 .
-    # Flaky retries aren't working well in this case. Need to shut
-    # down the browser between runs. This will be done in the new test
-    # harness (http://crbug.com/352807).
-    self.Fail('ContextLost_WebGLContextLostFromGPUProcessExit',
-              ['win7'], bug=619196)
+    self.Flaky('ContextLost_WebGLContextLostFromGPUProcessExit',
+               ['win7'], bug=603329)
 
     # Win8 Release and Debug NVIDIA bots.
     self.Skip('ContextLost_WebGLContextLostFromSelectElement',
               ['win8', 'nvidia'], bug=524808)
 
     # Flakily timing out on Win x64 Debug bot.
     # Unfortunately we can't identify this separately from the 32-bit bots.
     # Also unfortunately, the flaky retry mechanism doesn't work well in
     # this harness if the test times out. Skip it on this configuration for
     # now.
@@ skipping 14 matching lines @@
               ['android'], bug=609629)
     self.Skip('ContextLost_WebGLContextLostInHiddenTab',
               ['android'], bug=609629)
 
     # Nexus 6
     # The Nexus 6 times out on these tests while waiting for the JS to complete
     self.Fail('ContextLost_WebGLContextLostFromLoseContextExtension',
               ['android', ('qualcomm', 'Adreno (TM) 420')], bug=611906)
     self.Fail('ContextLost_WebGLContextLostFromQuantity',
               ['android', ('qualcomm', 'Adreno (TM) 420')], bug=611906)