Removing Page.WaitToLoad and update all pagesets to use explicit wait actions

content/test/gpu/gpu_tests/webgl_robustness.py

Index: content/test/gpu/gpu_tests/webgl_robustness.py
diff --git a/content/test/gpu/gpu_tests/webgl_robustness.py b/content/test/gpu/gpu_tests/webgl_robustness.py
index 507d770b9d880d5a83d5cc189e1d0c43bd09de51..f4b815933591cbc48aeefb7a5417403a20038002 100644
--- a/content/test/gpu/gpu_tests/webgl_robustness.py
+++ b/content/test/gpu/gpu_tests/webgl_robustness.py
@@ -57,7 +57,14 @@ class WebglRobustness(test.Test):
         {
           'url': 'file:///extra/lots-of-polys-example.html',
           'script_to_evaluate_on_commit': robustness_harness_script,
-          'wait_for_javascript_expression': 'webglTestHarness._finished'
+          'navigate_steps': [
+            {'action': 'navigate'},
+            {
+              'action': 'wait',
+              'condition': 'javascript',
+              'javascript': 'webglTestHarness._finished'
+            }
+          ]
         }
       ]
     }