Revert of Adding test to ensure context restoration due to GC doesn't crash...

Revert of Adding test to ensure context restoration due to GC doesn't crash (https://codereview.chromium.org/251443006/)

Reason for revert:
The new test is failing on multiple GPU bots. Will add links and stack traces to Issue 365747.


Original issue's description:
> Adding test to ensure context restoration due to GC doesn't crash
> 
> BUG=365747
> R=kbr@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266696

TBR=bajones@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=365747

Review URL: https://codereview.chromium.org/258073007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266719 0039d316-1c4b-4281-b951-d872f2087c98

content/test/data/gpu/webgl.html

@@ -59,35 +59,6 @@ function testContextRestored() {
     window.domAutomationController.send("FAILED");
 }
 
-function testQuantityLoss() {
-  var count = 0;
-  var iterations = 128;
-
-  function createAndDiscardContext() {
-    count++;
-
-    var c = document.createElement("canvas");
-    c.width = 1;
-    c.height = 1;
-
-    var ctx = c.getContext("experimental-webgl");
-    if (!ctx) {
-      return false;
-    }
-    ctx.clear(gl.COLOR_BUFFER_BIT);
-
-    if (count < iterations) {
-      window.requestAnimationFrame(createAndDiscardContext);
-    } else {
-      window.domAutomationController.setAutomationId(1);
-      alreadySetAutomationId = true;
-      window.domAutomationController.send("LOADED");
-    }
-  };
-
-  createAndDiscardContext();
-}
-
 function contextLostTest(kind)
 {
   switch (kind) {
@@ -108,12 +79,6 @@ function contextLostTest(kind)
       alreadySetAutomationId = true;
       window.domAutomationController.send("LOADED");
       break;
-    case "forced_quantity_loss":
-      // Test creates many new contexts, forcing the original context to be
-      // lost. Then a garbage collect is triggered and the original context is
-      // watched to ensure it restores properly.
-      testQuantityLoss();
-      break;
   }
 }
 

content/test/gpu/gpu_tests/context_lost.py

@@ -91,26 +91,6 @@ class _ContextLostValidator(page_test.PageTest):
           raise page_test.Failure(
             'Test failed (context not restored properly?)')
 
-    elif page.force_garbage_collection:
-      # Force GC to clean up any contexts not attached to the page.
-      tab.CollectGarbage()
-      completed = False
-      try:
-        print "Waiting for page to finish."
-        util.WaitFor(lambda: tab.EvaluateJavaScript(
-            'window.domAutomationController._finished'), wait_timeout)
-        completed = True
-      except util.TimeoutException:
-        pass
-
-      if not completed:
-        raise page_test.Failure(
-            'Test didn\'t complete (no context restored event?)')
-      if not tab.EvaluateJavaScript(
-        'window.domAutomationController._succeeded'):
-        raise page_test.Failure(
-          'Test failed (context not restored properly?)')
-
 class ContextLost(test_module.Test):
   enabled = True
   test = _ContextLostValidator
@@ -134,7 +114,6 @@ class ContextLost(test_module.Test):
           ],
           'kill_gpu_process': True,
           'number_of_gpu_process_kills': 1,
-          'force_garbage_collection': False
         },
         {
           'name': 'ContextLost.WebGLContextLostFromLoseContextExtension',
@@ -145,20 +124,7 @@ class ContextLost(test_module.Test):
             { 'action': 'wait',
               'javascript': 'window.domAutomationController._finished' }
           ],
-          'kill_gpu_process': False,
-          'force_garbage_collection': False
-        },
-        {
-          'name': 'ContextLost.WebGLContextLostFromQuantity',
-          'url': 'file://webgl.html?query=forced_quantity_loss',
-          'script_to_evaluate_on_commit': harness_script,
-          'navigate_steps': [
-            { 'action': 'navigate' },
-            { 'action': 'wait',
-              'javascript': 'window.domAutomationController._loaded' }
-          ],
-          'kill_gpu_process': False,
-          'force_garbage_collection': True
+          'kill_gpu_process': False
         },
       ]
     }