Oilpan: fix reported unit test leaks.

Source/core/dom/DocumentTest.cpp

 /*
  * Copyright (c) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/Document.h"
 
 #include "core/html/HTMLHeadElement.h"
 #include "core/html/HTMLLinkElement.h"
 #include "core/testing/DummyPageHolder.h"
+#include "platform/heap/Handle.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
 using namespace blink;
 
 namespace {
 
 class DocumentTest : public ::testing::Test {
 protected:
     virtual void SetUp() OVERRIDE;
 
+#if ENABLE(OILPAN)
+    virtual void TearDown() OVERRIDE
+    {
+        Heap::collectAllGarbage();
+    }
+#endif
+
     Document& document() const { return m_dummyPageHolder->document(); }
     Page& page() const { return m_dummyPageHolder->page(); }
 
 private:
     OwnPtr<DummyPageHolder> m_dummyPageHolder;
 };
 
 void DocumentTest::SetUp()
 {
     m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
@@ skipping 140 matching lines @@
     EXPECT_EQ(link, document().linkManifest());
     link->setAttribute(blink::HTMLNames::typeAttr, "image/gif");
     EXPECT_EQ(link, document().linkManifest());
     link->setAttribute(blink::HTMLNames::sizesAttr, "16x16");
     EXPECT_EQ(link, document().linkManifest());
     link->setAttribute(blink::HTMLNames::mediaAttr, "print");
     EXPECT_EQ(link, document().linkManifest());
 }
 
 } // unnamed namespace