Try to mark ContextLost_WebGLContextLostFromGPUProcessExit flaky again.

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 e7443e3611947df31c8606d37ae745c898f86e26..1b201a5a61352a5905f0c79d8db89a0d6acd1b74 100644
--- a/content/test/gpu/gpu_tests/context_lost_expectations.py
+++ b/content/test/gpu/gpu_tests/context_lost_expectations.py
@@ -17,12 +17,8 @@ class ContextLostExpectations(GpuTestExpectations):
         ['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',