Move depot_tools presubmit trybot from chromium.linux to infra.

masters/master.tryserver.chromium.linux/master.cfg

Index: masters/master.tryserver.chromium.linux/master.cfg
diff --git a/masters/master.tryserver.chromium.linux/master.cfg b/masters/master.tryserver.chromium.linux/master.cfg
index d6d997244a9cab0f86a2ff858f62c2608092af85..0fb44fadbd6d1571391986a3dadf6e4f5358b18f 100644
--- a/masters/master.tryserver.chromium.linux/master.cfg
+++ b/masters/master.tryserver.chromium.linux/master.cfg
@@ -332,7 +332,6 @@ def presubmit(name, slavebuilddir=None, extra_props=None):
 
 b_chromium_presubmit = presubmit('chromium', slavebuilddir='linux',
                                  extra_props={'runhooks': True})
-b_depot_tools_presubmit = presubmit('depot_tools')
 
 # These variable builders are used by Findit to identify culprit commits for
 # compile or test failures on the main waterfall. They run on optional slaves
@@ -364,7 +363,6 @@ c['builders'] = [
   b_chromium_presubmit,
   b_codesearch_chromeos_builder,
   b_codesearch_linux_builder,
-  b_depot_tools_presubmit,
   b_linux_chromium_asan_rel_ng,
   b_linux_chromium_browser_side_navigation_rel,
   b_linux_full_bisect_builder,