Remove references to TopSitesTest

TopSitesTest was renamed to TopSitesImplTest in crrev.com/197127,
hence references to TopSitesTest no longer make sense.

BUG=180467
TEST=none

Review URL: https://chromiumcodereview.appspot.com/15823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202014 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/history/top_sites.h

@@ -28,7 +28,6 @@ class RefCountedMemory;
 namespace history {
 
 class TopSitesCache;
-class TopSitesTest;
 
 // Interface for TopSites, which stores the data for the top "most visited"
 // sites. This includes a cache of the most visited data from history, as well

tools/valgrind/gtest_exclude/unit_tests.gtest.txt

@@ -31,7 +31,3 @@ NativeMessagingTest.*
 
 # Timing out all over the place. Disabling for now. http://crbug.com/164589
 StorageInfoProviderTest.*
-
-# Speculative disabling to see if it stops unit_tests hangs.
-# http://crbug.com/180467
-TopSitesTest.CreateTopSitesThenHistory