cc: Re-enable tile eviction iterator test with occlusion.

This patch re-enables a patch that was timing out on windows. This
code has changed significantly since it was disabled, and it's worth
seeing if the problem went away.

NOTE TO SHERIFFS
================

In case of a cc_unittest timeout (one of TileManager tests with
occlusion), please revert this. I'll monitor how it goes, but I might
miss it in the build.

R=danakj
BUG=401527

Review URL: https://codereview.chromium.org/588143006

Cr-Commit-Position: refs/heads/master@{#296038}

cc/resources/tile_manager_unittest.cc

@@ -928,15 +928,8 @@ TEST_F(TileManagerTilePriorityQueueTest, EvictionTilePriorityQueue) {
   EXPECT_EQ(all_tiles, new_content_tiles);
 }
 
-#if defined(OS_WIN)
-#define MAYBE_EvictionTilePriorityQueueWithOcclusion \
-  DISABLED_EvictionTilePriorityQueueWithOcclusion
-#else
-#define MAYBE_EvictionTilePriorityQueueWithOcclusion \
-  EvictionTilePriorityQueueWithOcclusion
-#endif
 TEST_F(TileManagerTilePriorityQueueTest,
-       MAYBE_EvictionTilePriorityQueueWithOcclusion) {
+       EvictionTilePriorityQueueWithOcclusion) {
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);