Fix memory leaks from adding GPU memory to task manager

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 5760 matching lines @@
 }
 {
    bug_143545
    Memcheck:Uninitialized
    fun:_ZN4aura10RootWindow10ShowCursorEb
    fun:_ZN3ash5Shell10ShowCursorEb
    fun:_ZN3ash13CursorManager10ShowCursorEb
    fun:_ZN3ash4test11AshTestBase5SetUpEv
 }
 {
-   bug_143563
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:_ZN16TaskManagerModel28RefreshVideoMemoryUsageStatsEv
-   fun:_ZN16TaskManagerModel7RefreshEv
-   fun:_ZN34TaskManagerTest_RefreshCalled_Test8TestBodyEv
-}
-{
    bug_143565
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN8appcache19AppCacheStorageImpl10InitializeERK8FilePathPN4base16MessageLoopProxyES6_
    fun:_ZN8appcache15AppCacheService10InitializeERK8FilePathPN4base16MessageLoopProxyES6_
    fun:_ZN21ChromeAppCacheService20InitializeOnIOThreadERK8FilePathPN7content15ResourceContextE13scoped_refptrIN5quota20SpecialStoragePolicyEE
 }
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
@@ skipping 16 matching lines @@
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }