valgrind: with my fix upstreamed, we can now remove this suppression.

tools/valgrind/suppressions.txt

 {
    Uninitialized value in deflate
    Memcheck:Cond
    fun:longest_match
    fun:deflate_slow
    fun:MOZ_Z_deflate
 }
 {
    gtk developers don't like cleaning up one-time leaks.  See http://mail.gnome.org/archives/gtk-devel-list/2004-April/msg00230.html
    Memcheck:Leak
@@ skipping 362 matching lines @@
    fun:_ZN7WebCore14ResourceHandle6createERKNS_15ResourceRequestEPNS_20ResourceHandleClientEPNS_5FrameEbbb
 }
 {
    # See http://crbug.com/9450
    v8_bindings_leak_crbug_9450
    Memcheck:Leak
    fun:_Znwj
    fun:_ZN7WebCore7V8Proxy20RegisterGlobalHandleENS_16GlobalHandleTypeEPvN2v810PersistentINS3_5ValueEEE
 }
 {
-   # Font memory leak.  See http://crbug.com/9475
-   bug_9475
-   Memcheck:Leak
-   fun:_Znwj
-   fun:_ZN7WebCore9FontCache22createFontPlatformDataERKNS_15FontDescriptionERKNS_12AtomicStringE
-}
-{
    # V8 leak?  See http://crbug.com/9458
    bug_9458
    Memcheck:Leak
    fun:_Znwj
    fun:_NPN_RegisterObject
    fun:_Z25CreateV8ObjectForNPObjectP8NPObjectS0_
 }
 {
    # webkit leak?  See http://crbug.com/9503
    bug_9503
@@ skipping 189 matching lines @@
    Memcheck:Cond
    fun:strlen
    ...
    fun:__xmlRaiseError
    ...
    fun:_ZN16Toolbar5Importer17LocateNextOpenTagEP9XmlReader
    fun:_ZN16Toolbar5Importer27LocateNextTagWithStopByNameEP9XmlReaderRKSsS3_
    fun:_ZN16Toolbar5Importer24ParseBookmarksFromReaderEP9XmlReaderPSt6vectorIN13ProfileWriter13BookmarkEntryESaIS4_EE
    fun:_ZN39Toolbar5ImporterTest_BookmarkParse_Test8TestBodyEv
 }