Fix leak in generated credit card bubble tests.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index 2bd1806022c6a9152abf21cc5b855ec7134bcbfa..78b3f47cdaea68a1a552258e8027a8f336447e3d 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -7198,14 +7198,3 @@
    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
-}