Update TaskTraits in sw_reporter_installer_win.cc.

chrome/browser/component_updater/sw_reporter_installer_win.cc

Index: chrome/browser/component_updater/sw_reporter_installer_win.cc
diff --git a/chrome/browser/component_updater/sw_reporter_installer_win.cc b/chrome/browser/component_updater/sw_reporter_installer_win.cc
index 34241417ab0b2c0d977c7f03b49d22566ba75fda..abe39d0593c5a86544419181a17cad543fecf023 100644
--- a/chrome/browser/component_updater/sw_reporter_installer_win.cc
+++ b/chrome/browser/component_updater/sw_reporter_installer_win.cc
@@ -136,13 +136,15 @@ void RunSwReportersAfterStartup(
       FROM_HERE, base::ThreadTaskRunnerHandle::Get(),
       base::Bind(&safe_browsing::RunSwReporters, invocations, version,
                  base::ThreadTaskRunnerHandle::Get(),
-                 // Runs LaunchAndWaitForExit() (srt_fetcher_win.cc).
+                 // Runs LaunchAndWaitForExit() which creates and joins a
+                 // process, hence MayBlock() and WithSyncPrimitives().

[gab, 2016/12/21 16:11:01]

// Runs LaunchAndWaitForExit() which creates (MayBlock()) and joins
(WithSyncPrimitives()) a process.

(to be specific about which operation requires which trait?)

[joenotcharles, 2016/12/21 16:20:36]

Yes, please clarify this.

[fdoray, 2016/12/21 16:28:42]

Done.

                  base::CreateTaskRunnerWithTraits(
                      base::TaskTraits()
                          .WithShutdownBehavior(
                              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
                          .WithPriority(base::TaskPriority::BACKGROUND)
-                         .WithWait())));
+                         .MayBlock()
+                         .WithSyncPrimitives())));
 }
 
 // Ensures |str| contains only alphanumeric characters and characters from