Move the Widget hierarchy to the Oilpan heap.

Source/core/css/MediaQueryEvaluatorTest.cpp

Index: Source/core/css/MediaQueryEvaluatorTest.cpp
diff --git a/Source/core/css/MediaQueryEvaluatorTest.cpp b/Source/core/css/MediaQueryEvaluatorTest.cpp
index f982909ebcdd6a8cf1c5baf3b393ed6ee0e9e56c..fcc6cae88a32292bc5230d0ce705c92058771466 100644
--- a/Source/core/css/MediaQueryEvaluatorTest.cpp
+++ b/Source/core/css/MediaQueryEvaluatorTest.cpp
@@ -77,8 +77,9 @@ TestCase printTestCases[] = {
 
 void testMQEvaluator(TestCase* testCases, const MediaQueryEvaluator& mediaQueryEvaluator)
 {
+    RefPtrWillBePersistent<MediaQuerySet> querySet = nullptr;

[haraken, 2014/09/26 09:19:25]

RefPtrWillBeRawPtr ?

[sof, 2014/09/26 09:41:05]

We had several rounds of this in ImageBitmapTest & the conclusion is that we
need to use RefPtrWillBePersistent<> in tests to reliably hold onto heap
objects.

Should a GC strike from within this test method, it won't scan the stack. Unless
something has changed recently.

[haraken, 2014/09/26 09:50:25]

oh, this is in a test. Makes sense to use a Persistent.

     for (unsigned i = 0; testCases[i].input; ++i) {
-        RefPtrWillBeRawPtr<MediaQuerySet> querySet = MediaQuerySet::create(testCases[i].input);
+        querySet = MediaQuerySet::create(testCases[i].input);
         ASSERT_EQ(testCases[i].output, mediaQueryEvaluator.eval(querySet.get()));
     }
 }
@@ -125,10 +126,10 @@ TEST(MediaQueryEvaluatorTest, Dynamic)
 TEST(MediaQueryEvaluatorTest, DynamicNoView)
 {
     OwnPtr<DummyPageHolder> pageHolder = DummyPageHolder::create(IntSize(500, 500));
-    RefPtr<FrameView> view = pageHolder->frame().view();
+    RefPtrWillBePersistent<FrameView> view = pageHolder->frame().view();

[haraken, 2014/09/26 09:19:25]

RefPtrWillBeRawPtr ?

     pageHolder->frame().setView(nullptr);
     MediaQueryEvaluator mediaQueryEvaluator(&pageHolder->frame());
-    RefPtrWillBeRawPtr<MediaQuerySet> querySet = MediaQuerySet::create("foobar");
+    RefPtrWillBePersistent<MediaQuerySet> querySet = MediaQuerySet::create("foobar");

[haraken, 2014/09/26 09:19:25]

RefPtrWillBeRawPtr ?

     bool output = false;
     ASSERT_EQ(output, mediaQueryEvaluator.eval(querySet.get()));
     pageHolder->frame().setView(view);