Fix uninitialized access in QuicInMemoryCache::GetKey

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 # running overnight and removing outdated bugs/suppressions.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 6295 matching lines @@
 }
 {
    bug_329339
    Memcheck:Uninitialized
    ...
    fun:_ZN3net18ProxyScriptDecider*
    fun:_ZN3net18ProxyScriptDecider6DoLoopEi
    fun:_ZN3net18ProxyScriptDecider*
 }
 {
-   bug_329951
-   Memcheck:Uninitialized
-   fun:_ZNK3net5tools17QuicInMemoryCache6GetKeyERKNS_12BalsaHeadersE
-   ...
-   fun:_ZN3net5tools4test12_GLOBAL__N_151QuicSpdyServerStreamTest_TestSendErrorResponse_Test8TestBodyEv
-}
-{
    bug_329960
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN7WebCore22V8PerContextDataHolder7installEN2v86HandleINS1_7ContextEEE
    fun:_ZN7WebCore22WorkerScriptController25initializeContextIfNeededEv
    ...
    fun:_ZN7WebCore12WorkerThread12workerThreadEv
 }