Skip ContextLost.WebGLContextLostFromQuantity on Win Debug.

content/test/gpu/gpu_tests/context_lost_expectations.py

Index: content/test/gpu/gpu_tests/context_lost_expectations.py
diff --git a/content/test/gpu/gpu_tests/context_lost_expectations.py b/content/test/gpu/gpu_tests/context_lost_expectations.py
index 0f0c4f9457138e3a0b33ff4e2775a7b80e76c958..81bb7d25120814ac488b6ec1d98ce26e25715fbe 100644
--- a/content/test/gpu/gpu_tests/context_lost_expectations.py
+++ b/content/test/gpu/gpu_tests/context_lost_expectations.py
@@ -28,11 +28,13 @@ class ContextLostExpectations(GpuTestExpectations):
     self.Skip('ContextLost.WebGLContextLostFromSelectElement',
               ['win8', 'nvidia'], bug=524808)
 
-    # Flaky on Win x64 Debug bot.
+    # Flakily timing out on Win x64 Debug bot.
     # Unfortunately we can't identify this separately from the 32-bit bots.
-    # Try marking it flaky to see if this works around the problem.
-    self.Flaky('ContextLost.WebGLContextLostFromQuantity',
-               ['win', 'debug'], bug=628697)
+    # 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.
+    self.Skip('ContextLost.WebGLContextLostFromQuantity',
+              ['win', 'debug'], bug=628697)
 
     # Flaky on Mac 10.7 and 10.8 resulting in crashes during browser
     # startup, so skip this test in those configurations.