Fix leak in generated credit card bubble tests.

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 # running overnight and removing outdated bugs/suppressions.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 7180 matching lines @@
    fun:_ZN7WebCore22SkiaImageFilterBuilder5buildERKNS_16FilterOperationsE
 }
 {
    bug_270312
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN14message_center22MessageCenterButtonBarC1EPNS_17MessageCenterViewEPNS_13MessageCenterEPNS_24NotifierSettingsProviderEb
    fun:_ZN14message_center17MessageCenterViewC1EPNS_13MessageCenterEPNS_17MessageCenterTrayEibb
    fun:_ZN14message_center21MessageCenterViewTest5SetUpEv
 }
-{
-   bug_271431
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN8autofill33TestGeneratedCreditCardBubbleView6CreateERKN4base7WeakPtrINS_35GeneratedCreditCardBubbleControllerEEE
-   fun:_ZN8autofill12_GLOBAL__N_139TestGeneratedCreditCardBubbleController12CreateBubbleEv
-   fun:_ZN8autofill35GeneratedCreditCardBubbleController4ShowEb
-   fun:_ZN8autofill35GeneratedCreditCardBubbleController12SetupAndShowERKSbItN4base20string16_char_traitsESaItEES6_
-   fun:_ZN8autofill35GeneratedCreditCardBubbleController4ShowEPN7content11WebContentsERKSbItN4base20string16_char_traitsESaItEES9_
-   fun:_ZN8autofill12_GLOBAL__N_139GeneratedCreditCardBubbleControllerTest4ShowEv
-}