Add wrapper container for a vector of OwnPtr<T>

cc/test/CCLayerTestCommon.cpp

Index: cc/test/CCLayerTestCommon.cpp
diff --git a/cc/test/CCLayerTestCommon.cpp b/cc/test/CCLayerTestCommon.cpp
index 7fb0afc9172726d5f966a5b0c37c9281813bcb66..81753d4544c4f61261aeb87f319a47cd054abd63 100644
--- a/cc/test/CCLayerTestCommon.cpp
+++ b/cc/test/CCLayerTestCommon.cpp
@@ -22,7 +22,7 @@ void verifyQuadsExactlyCoverRect(const CCQuadList& quads, const IntRect& rect)
     Region remaining(rect);
 
     for (size_t i = 0; i < quads.size(); ++i) {
-        CCDrawQuad* quad = quads[i].get();
+        CCDrawQuad* quad = quads[i];
         IntRect quadRect = quad->quadRect();
 
         EXPECT_TRUE(rect.contains(quadRect)) << quadString << i;