Fix memory leaks from adding GPU memory to task manager

tools/heapcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1472 matching lines @@
 }
 {
    bug_143431
    Heapcheck:Leak
    ...
    fun:ManagedMode::ManagedMode
    fun:*FakeManagedMode
    fun:ManagedModeTest::ManagedModeTest
 }
 {
-   bug_143563
-   Heapcheck:Leak
-   ...
-   fun:TaskManagerModel::RefreshVideoMemoryUsageStats
-   fun:TaskManagerModel::Refresh
-   fun:TaskManagerTest_RefreshCalled_Test::TestBody
-}
-{
    bug_143565
    Heapcheck:Leak
    ...
    fun:appcache::AppCacheStorageImpl::Initialize
    fun:appcache::AppCacheService::Initialize
    fun:ChromeAppCacheService::InitializeOnIOThread
 }