cc: Fullscreen overlay removes all the other quads/planes.

cc/output/overlay_unittest.cc

Index: cc/output/overlay_unittest.cc
diff --git a/cc/output/overlay_unittest.cc b/cc/output/overlay_unittest.cc
index f0eb6a8b9c3058c7c2e9f2af443cfec5d68b2eff..f9264a9ad12b4dac31b07bdec697b78341c72d23 100644
--- a/cc/output/overlay_unittest.cc
+++ b/cc/output/overlay_unittest.cc
@@ -423,10 +423,12 @@ TEST_F(FullscreenOverlayTest, SuccessfulOverlay) {
   ASSERT_EQ(1U, candidate_list.size());
 
   RenderPass* main_pass = pass.get();
-  // Check that the quad is gone.
-  EXPECT_EQ(1U, main_pass->quad_list.size());
+  // Check that all the quads are gone.
+  EXPECT_EQ(0U, main_pass->quad_list.size());
+  // Check that we have only one overlay.
+  EXPECT_EQ(1U, candidate_list.size());
   // Check that the right resource id got extracted.
-  EXPECT_EQ(original_resource_id, candidate_list.back().resource_id);
+  EXPECT_EQ(original_resource_id, candidate_list.front().resource_id);
 }
 
 TEST_F(FullscreenOverlayTest, ResourceSizeInPixelsFail) {