Roll src/third_party/depot_tools/ 82a6480a3..dbbf350a3 (2 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/82a6480a3a0d..dbbf350a34ab

$ git log 82a6480a3..dbbf350a3 --date=short --no-merges --format='%ad %ae %s'
2018-03-23 iannucci Fix trailing whitespace test.
2018-03-23 iannucci Fix actual pylint errors.

Created with:
  roll-dep src/third_party/depot_tools
BUG=chromium:825290,chromium:825174,chromium:825290,chromium:825174


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Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
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TBR=agable@chromium.org

Change-Id: If3ca536bc4f21f1f692b3c6ebdffae05203db93b
Reviewed-on: https://chromium-review.googlesource.com/979293Reviewed-by: depot-tools-chromium-autoroll <depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: depot-tools-chromium-autoroll <depot-tools-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#545672}

DEPS

@@ -433,7 +433,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '82a6480a3a0d67c1d8ad99809eafcbf87468fb52',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + 'dbbf350a34ab7991e635f91a70bd2d211eb921be',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),