Fix ref leak in WebSocketServerSocketImpl introduced in r115422.

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 5151 matching lines @@
 }
 {
    bug_108398
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN16BrowserThemePack18BuildFromExtensionEPK9Extension
    fun:_ZN45BrowserThemePackTest_CanBuildAndReadPack_Test8TestBodyEv
 }
 {
-   bug_108399
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:*WebSocketServerSocketImpl16ProcessHandshakeEvEN6Buffer*
-   fun:*WebSocketServerSocketImpl16ProcessHandshakeEv
-   fun:*WebSocketServerSocketImpl6OnReadEi
-}
-{
    bug_108531
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN14RenderViewHost*
    ...
    fun:_ZN11BalloonHost4InitEv
    fun:_ZN15BalloonViewHost4InitEP10_GtkWidget
    fun:_ZN19BalloonViewHostView20ViewHierarchyChangedEbPN5views4ViewES2_
    fun:_ZN5views4View24ViewHierarchyChangedImplEbbPS0_S1_
@@ skipping 547 matching lines @@
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }