Fix ref leak in WebSocketServerSocketImpl introduced in r115422.

tools/heapcheck/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 # running overnight and removing outdated bugs/suppressions.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 1699 matching lines @@
    fun:chromeos::::GViewRequestInterceptorTest::SetUp
 }
 {
    bug_108398
    Heapcheck:Leak
    ...
    fun:BrowserThemePack::BuildFromExtension
    fun:BrowserThemePackTest_CanBuildAndReadPack_Test::TestBody
 }
 {
-   bug_108399
-   Heapcheck:Leak
-   ...
-   fun:*Buffer
-   fun:::WebSocketServerSocketImpl::ProcessHandshake
-   fun:::WebSocketServerSocketImpl::OnRead
-}
-{
    bug_109613
    Heapcheck:Leak
    fun:AutofillProfileSyncableServiceTest::SetUp
 }
 {
    bug_110955
    Heapcheck:Leak
    fun:browser_sync::TypedUrlDataTypeController::StopAssociationAsync
    fun:browser_sync::NonFrontendDataTypeController::Stop
    fun:browser_sync::DataTypeManagerImpl::FinishStop
@@ skipping 67 matching lines @@
 
 {
    bug_112416
    Heapcheck:Leak
    fun:FLAC__MD5Accumulate
    fun:process_frame_
    fun:FLAC__stream_encoder_process
    fun:::FLACEncoder::Encode
    ...
 }