Roll src/third_party/depot_tools/ 2a5f70cc0..1118a2193 (6 commits)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/2a5f70cc060a..1118a2193b8f

$ git log 2a5f70cc0..1118a2193 --date=short --no-merges --format='%ad %ae %s'
2018-04-05 ehmaldonado gclient_eval: Support unpinned dependencies in SetRevision.
2018-04-05 ehmaldonado gclient_eval: Add more support when adding new variables.
2018-04-05 ehmaldonado gclient setdep: Command line interface nits.
2018-04-05 ehmaldonado presubmit_unittest: Remove redundant tests.
2018-04-05 sergeyberezin Roll mac_toolchain to 496a91484
2018-04-05 borenet roll-dep: Fix behavior for relative DEPS

Created with:
  roll-dep src/third_party/depot_tools
BUG=chromium:760633,chromium:760633,chromium:760633,chromium:829134,chromium:797051


The AutoRoll server is located here: https://depot-tools-chromium-roll.skia.org

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
be CC'd on the roll, and stop the roller if necessary.


TBR=agable@chromium.org

Change-Id: Ibc387b556140307f5ed87c799cb5318c8c59e631
Reviewed-on: https://chromium-review.googlesource.com/999308Reviewed-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@{#548671}

DEPS

@@ -436,7 +436,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '2a5f70cc060a23729058736704e777daf4bbcae7',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '1118a2193b8f7b77c0e2336fa9528645ae70e804',
 
   'src/third_party/devtools-node-modules':
     Var('chromium_git') + '/external/github.com/ChromeDevTools/devtools-node-modules' + '@' + Var('devtools_node_modules_revision'),