Valgrind: Remove a suppression for a bug that has been fixed.

BUG=290435
TBR=rtoy@chromium.org

Review URL: https://codereview.chromium.org/433353002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287262 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -5338,14 +5338,6 @@
    fun:_ZN3gpu5gles216GLES2DecoderImpl9DoCommandEjjPKv
    fun:_ZN3gpu13CommandParser14ProcessCommandEv
 }
-{
-   bug_290435
-   Memcheck:Uninitialized
-   fun:_ZN5blink12AudioContext20scheduleNodeDeletionEv
-   fun:_ZN5blink12AudioContext21handlePostRenderTasksEv
-   fun:_ZN5blink20AudioDestinationNode6renderEPNS_8AudioBusES2_m
-   fun:_ZN5blink27OfflineAudioDestinationNode13offlineRenderEv
-}
 {
    bug_293024_b
    Memcheck:Leak