Remove suppression of unaddr error at AppendValueAsJSON

The bug might have been fixed. Try to remove the suppression to see
result. Will revert if the error still occurs.

NOTRY=true
TBR=rsesek,zhaoqin
BUG=382789

Review URL: https://codereview.chromium.org/339373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278110 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions.txt

@@ -585,22 +585,6 @@ name=http://crbug.com/382784
 *!media::AudioDeviceThread::Thread::Run
 *!media::AudioDeviceThread::Thread::ThreadMain
 
-UNADDRESSABLE ACCESS
-name=http://crbug.com/382789
-...
-*!base::debug::TraceEvent::AppendValueAsJSON
-*!base::debug::TraceEvent::AppendAsJSON
-*!base::debug::TraceLog::ConvertTraceEventsToTraceFormat
-*!base::debug::TraceLog::FinishFlush
-*!base::internal::Invoker<>::Run
-*!base::MessageLoop::RunTask
-*!base::MessageLoop::DeferOrRunPendingTask
-*!base::MessageLoop::DoWork
-*!base::MessagePumpForIO::DoRunLoop
-*!base::MessagePumpWin::Run
-*!base::MessageLoop::RunHandler
-*!base::Thread::Run
-
 HANDLE LEAK
 name=http://crbug.com/383408
 system call NtCreateEvent