Add TSAN StatisticsRecorder::StatisticsRecorder suppression.

tools/valgrind/tsan/suppressions.txt

 # There are a few 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 # running overnight and removing outdated bugs/suppressions.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 670 matching lines @@
    bug_104769
    ThreadSanitizer:Race
    fun:timeout_correct
    fun:event_base_loop
    fun:base::MessagePumpLibevent::Run
    fun:MessageLoop::RunInternal
    fun:MessageLoop::RunHandler
    fun:MessageLoop::Run
 }
 {
+  bug_104776_maybe_benign
+  ThreadSanitizer:Race
+  fun:base::StatisticsRecorder::StatisticsRecorder
+  fun:BrowserMain
+  fun:::RunNamedProcessTypeMain
+  fun:content::ContentMain
+  fun:ChromeMain
+  fun:main
+}
+{
   bug_105579
   ThreadSanitizer:Race
   fun:net::SdchManager::EnableSdchSupport
   fun:net::SdchManager::Shutdown
 }