Remove obsolete valgrind suppressions for bug 46420.

The code in question that was suppressed no longer exists in the current version.

BUG=46420
TEST=none

Review URL: http://codereview.chromium.org/7754013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@100144 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -2266,19 +2266,6 @@
    fun:_ZN11MessageLoop15AddTaskObserverEPNS_12TaskObserverE
    fun:*IOJankObserver21AttachToCurrentThreadEv
 }
-{
-   bug_46420a
-   Memcheck:Addr4
-   fun:_Z25WillHandleBrowserAboutURLP4GURLP7Profile
-   fun:_ZN54BrowserAboutHandlerTest_WillHandleBrowserAboutURL_Test8TestBodyEv
-}
-{
-   bug_46420b
-   Memcheck:Addr4
-   fun:*StackDumpSignalHandler*
-   ...
-   fun:_ZN54BrowserAboutHandlerTest_WillHandleBrowserAboutURL_Test8TestBodyEv
-}
 {
    bug_47950
    Memcheck:Leak