This reverts commit 7f4c905f.

Reason for revert:
When running "gclient sync" on a V8 checkout, it says:

  File "/work/chrome/depot_tools/gclient.py", line 995, in run
   self.ParseDepsFile()
 File "/work/chrome/depot_tools/gclient.py", line 874, in ParseDepsFile
   self._postprocess_deps(deps, rel_prefix), use_relative_paths)
 File "/work/chrome/depot_tools/gclient.py", line 660, in _postprocess_deps
   dval['condition'], self.condition)
TypeError: '_NodeDict' object does not support item assignment

on the recursive descent into third_party/android_tools/DEPS. Any chance that's related to https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/950405 ?

Original change's description:
> gclient: Add commands to edit dependencies and variables in DEPS
> 
> Adds 'gclient setvar' and 'gclient setdep' commands to edit variables
> and dependencies in a DEPS file.
> 
> Bug: 760633
> Change-Id: I6c0712cc079dbbbaee6541b7eda71f4b4813b77b
> Reviewed-on: https://chromium-review.googlesource.com/950405
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>

TBR=agable@chromium.org,ehmaldonado@chromium.org

Change-Id: If58f6b15d31b19fc53294f1e41d26b4e684a2cf9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 760633
Reviewed-on: https://chromium-review.googlesource.com/969165Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>