Bug 1131165 - Increase xpcshell timeout to closer to 2 hours r=garndt

--HG--
extra : rebase_source : 328b87b1322d97f0800f9bcebc7e0099af89a8b9
extra : histedit_source : 251bd37e04cd32f61add66751cde706c949a9c6e

testing/taskcluster/tasks/tests/b2g_emulator_xpcshell.yml

@@ -7,6 +7,7 @@ task:
     description: XPCShell test run
 
   payload:
+    maxRunTime: 6000
     command:
       - entrypoint
       - >

testing/taskcluster/tasks/tests/b2g_emulator_xpcshell_chunked.yml

@@ -7,6 +7,7 @@ task:
     description: XPCShell test run {{chunk}}
 
   payload:
+    maxRunTime: 6000
     command:
       - entrypoint
       - >