Valgrind: Update a suppression.

BUG=298788
NOTRY=true
TBR=thakis@chromium.org

Review URL: https://codereview.chromium.org/446643003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287647 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -5305,7 +5305,7 @@
    bug_298788
    Memcheck:Leak
    fun:_Znw*
-   fun:_ZN10extensions19TestExtensionSystem22CreateExtensionServiceEPK11CommandLineRKN4base8FilePathEb
+   fun:_ZN10extensions19TestExtensionSystem22CreateExtensionServiceEPKN4base11CommandLineERKNS1_8FilePathEb
    fun:_ZN10extensions12_GLOBAL__N_130ExtensionActionIconFactoryTest5SetUpEv
 }
 {