Fix unit test leak in DeviceOAuth2TokenServiceTest.

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 # running overnight and removing outdated bugs/suppressions.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 7042 matching lines @@
    fun:_ZN2cc17LayerTreeHostImpl18InitializeRendererE10scoped_ptrINS_13OutputSurfaceEN4base14DefaultDeleterIS2_EEE
    fun:_ZN2cc11ThreadProxy30InitializeRendererOnImplThreadEPNS_15CompletionEventEPbPNS_20RendererCapabilitiesE
 }
 {
    bug_233128
    Memcheck:Leak
    ...
    fun:_ZN10extensions51WebstoreInlineInstallerTest_DomainVerification_Test8TestBodyEv
 }
 {
-   bug_233149
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN8chromeos52DeviceOAuth2TokenServiceTest_SaveEncryptedToken_Test8TestBodyEv
-}
-{
    bug_233541
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN22DiskCacheTestWithCache13CreateBackendEjPN4base6ThreadE
    fun:_ZN22DiskCacheTestWithCache13InitDiskCacheEv
    fun:_ZN22DiskCacheTestWithCache9InitCacheEv
    fun:*DiskCacheBackendTest_SimpleDoom*
 }
 {
    bug_233541_a
    Memcheck:Unaddressable
    ...
    fun:_ZN11GrEffectRefD0Ev
    fun:_ZNK8SkRefCnt16internal_disposeEv
    fun:_ZNK8SkRefCnt5unrefEv
 }
 {
    bug_233541_b
    Memcheck:Unaddressable
    ...
    fun:_ZN14DeferredDevice5flushEv
    fun:_ZN8SkCanvas5flushEv
    fun:_ZN7WebCore19Canvas2DLayerBridge14prepareTextureERN6WebKit17WebTextureUpdaterE
    fun:_ZN6webkit27WebExternalTextureLayerImpl14PrepareTextureEPN2cc19ResourceUpdateQueueE
    fun:_ZN2cc12TextureLayer6UpdateEPNS_19ResourceUpdateQueueEPKNS_20OcclusionTrackerBaseINS_5LayerENS_13RenderSurfaceEEEPNS_14RenderingStatsE
    fun:_ZN2cc13LayerTreeHost18PaintLayerContentsERKSt6vectorI13scoped_refptrINS_5LayerEESaIS4_EEPNS_19ResourceUpdateQueueE
    fun:_ZN2cc13LayerTreeHost12UpdateLayersEPNS_5LayerEPNS_19ResourceUpdateQueueE
 }