Add four new suppressions, widen one.

tools/valgrind/memcheck/suppressions.txt

 # There are three 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 # running overnight and removing outdated bugs/suppressions.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 828 matching lines @@
    fun:_ZN7WebCore5Frame4initEv
 }
 {
    bug_17113
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN18ResourceDispatcher12CreateBridgeERKSsRK4GURLS4_S4_S1_S1_S1_iiN12ResourceType4TypeEjii
    fun:_ZN11webkit_glue20ResourceLoaderBridge6CreateERKSsRK4GURLS5_S5_S2_S2_S2_iiN12ResourceType4TypeEii
    fun:_ZN11webkit_glue16WebURLLoaderImpl7Context5StartERKN6WebKit13WebURLRequestEPNS_20ResourceLoaderBridge16SyncLoadResponseE
    fun:_ZN11webkit_glue16WebURLLoaderImpl18loadAsynchronouslyERKN6WebKit13WebURLRequestEPNS1_18WebURLLoaderClientE
-   fun:_ZN11webkit_glue15ResourceFetcher5StartEP8WebFrame
-   fun:_ZN11webkit_glue15ResourceFetcherC1ERK4GURLP8WebFrameP14CallbackRunnerI6Tuple2IRKN6WebKit14WebURLResponseERKSsEE
 }
 {
    bug_17185
    Memcheck:Leak
    fun:malloc
    fun:_ZN3WTF10fastMallocEj
    fun:_ZN7WebCore10StringImpl19createUninitializedEjRPt
    ...
    fun:_ZN7WebCore10Pasteboard14writeSelectionEPNS_5RangeEbPNS_5FrameE
 }
 {
    bug_17187
    Memcheck:Leak
    fun:malloc
    fun:_ZN3WTF10fastMallocEj
    fun:_ZN7WebCore10StringImpl19createUninitializedEjRPt
    fun:_ZN7WebCore10StringImpl6createEPKtj
    fun:_ZN6WebKit9WebString6assignEPKtj
    fun:_ZN20MockWebClipboardImpl10writeImageERKN6WebKit8WebImageERKNS0_6WebURLERKNS0_9WebStringE
    fun:_ZN7WebCore14ChromiumBridge19clipboardWriteImageEPK15NativeImageSkiaRKNS_4KURLERKNS_6StringE
    fun:_ZN7WebCore10Pasteboard10writeImageEPNS_4NodeERKNS_4KURLERKNS_6StringE
 }
 {
+   bug_17291
+   Memcheck:Leak
+   fun:malloc
+   fun:_ZN3WTF10fastMallocE*
+   fun:_ZN7WebCore19V8EventListenerList3addEPNS_15V8EventListenerE
+   fun:_ZN7WebCore19V8EventListenerList19findOrCreateWrapperINS_15V8EventListenerEEEN3WTF10PassRefPtrIS2_EEPNS_5FrameEN2v85LocalINS8_5ValueEEEb
+   fun:_ZN7WebCore8V8Custom37v8DOMWindowEventHandlerAccessorSetterEN2v85LocalINS1_6StringEEENS2_INS1_5ValueEEERKNS1_12AccessorInfoE
+   fun:_ZN2v88internal8JSObject23SetPropertyWithCallbackEPNS0_6ObjectEPNS0_6StringES3_PS1_
+}
+{
    # also bug 17979.  It's a nest of leaks.
    bug_17385
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN3IPC12ChannelProxy7Context13CreateChannelERKSsRKNS_7Channel4ModeE
    fun:_ZN3IPC12ChannelProxy4InitERKSsNS_7Channel4ModeEP11MessageLoopb
    fun:_ZN3IPC12ChannelProxyC2ERKSsNS_7Channel4ModeEP11MessageLoopPNS0_7ContextEb
    ...
    fun:_ZN3IPC11SyncChannelC1ERKSsNS_7Channel4ModeEPNS3_8ListenerEPNS_12ChannelProxy13MessageFilterEP11MessageLoopbPN4base13WaitableEventE
@@ skipping 215 matching lines @@
    Memcheck:Leak
    fun:malloc
    fun:g_malloc
    fun:g_slice_alloc
    fun:handlers_find
    fun:signal_handlers_foreach_matched_R
    fun:g_signal_handlers_disconnect_matched
    fun:gtk_accel_group_disconnect
    fun:gtk_accel_group_disconnect_key
 }