Remove suppression for leak from GDataFileSystemTest

crrev.com/140552 fixed the leak.

BUG=121450
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10534068

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@141256 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -5131,14 +5131,6 @@
    fun:_ZN17AudioRendererHost16OnChannelClosingEv
    fun:_ZN3IPC12ChannelProxy7Context15OnChannelClosedEv
 }
-{
-   bug_121450
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEESA_
-   fun:_ZN4base10TaskRunner16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEES9_
-   fun:_ZN5gdata15GDataFileSystem21LoadRootFeedFromCacheENS0_13FeedChunkTypeE*K8FilePathbRKN4base8CallbackIFvNS5_17PlatformFileErrorES4_PNS_13GDataFileBaseEEEE
-}
 {
    bug_121729
    Memcheck:Leak