Suppress two memory errors in spdy tests.

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 # running overnight and removing outdated bugs/suppressions.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 2650 matching lines @@
    fun:_ZN7WebCore18NotificationCenter18createNotificationERKNS_6StringES3_S3_Ri
    fun:_ZN7WebCore20V8NotificationCenter26createNotificationCallbackERKN2v89ArgumentsE
    fun:_ZN2v88internal19HandleApiCallHelperILb0EEEPNS0_6ObjectENS0_47_GLOBAL__N_v8_src_builtins.cc_00000000_2CCEFB9216BuiltinArgumentsILNS0_21BuiltinExtraArgumentsE1EEE
    obj:*
    obj:*
    obj:*
    obj:*
    obj:*
    fun:_ZN2v88internal6InvokeEbNS0_6HandleINS0_10JSFunctionEEENS1_INS0_6ObjectEEEiPPPS4_Pb
 }
+{
+   bug_42877
+   Memcheck:Addr4
+   fun:_ZN3net8IOBuffer4dataEv
+   fun:_ZN3net19MockTCPClientSocket12CompleteReadEv
+   fun:_ZN3net19MockTCPClientSocket14OnReadCompleteERKNS_8MockReadE
+   fun:_ZN3net17DelayedSocketData12CompleteReadEv
+   fun:_Z16DispatchToMethodIN3net17DelayedSocketDataEMS1_FvvEEvPT_T0_RK6Tuple0
+   fun:_ZN27ScopedRunnableMethodFactoryIN3net17DelayedSocketDataEE14RunnableMethodIMS1_FvvE6Tuple0E3RunEv
+   fun:_ZN11MessageLoop7RunTaskEP4Task
+   fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
+   fun:_ZN11MessageLoop13DoDelayedWorkEPN4base4TimeE
+   fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
+   fun:_ZN11MessageLoop11RunInternalEv
+   fun:_ZN11MessageLoop10RunHandlerEv
+}
+{
+   bug_42877
+   Memcheck:Addr1
+   fun:memcpy
+   fun:_ZN3net19MockTCPClientSocket12CompleteReadEv
+   fun:_ZN3net19MockTCPClientSocket14OnReadCompleteERKNS_8MockReadE
+   fun:_ZN3net17DelayedSocketData12CompleteReadEv
+   fun:_Z16DispatchToMethodIN3net17DelayedSocketDataEMS1_FvvEEvPT_T0_RK6Tuple0
+   fun:_ZN27ScopedRunnableMethodFactoryIN3net17DelayedSocketDataEE14RunnableMethodIMS1_FvvE6Tuple0E3RunEv
+   fun:_ZN11MessageLoop7RunTaskEP4Task
+   fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
+   fun:_ZN11MessageLoop13DoDelayedWorkEPN4base4TimeE
+   fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
+   fun:_ZN11MessageLoop11RunInternalEv
+   fun:_ZN11MessageLoop10RunHandlerEv
+}