gclient: Fix roll-dep.

Bug: 839925
Change-Id: I5a56ad03866bd0b8f7d43bb3a643372d7b66343c
Reviewed-on: https://chromium-review.googlesource.com/1064692
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

recipes/trigger_recipe_roller.txt

@@ -5,4 +5,5 @@ Once upon a time, a budding web browser dev team needed a CI system.
 All they had was one poor machine under a desk, and its name was Batty,
 the Build and Test Yeti.
 
-As the CI needs of the browser grew, Batty, the Build and Test Yeti,
+As the CI needs of the browser grew, Batty, the Build and Test Yeti, got
+a new friend:

roll_dep.py

@@ -225,7 +225,7 @@ def main():
     # First gather all the information without modifying anything, except for a
     # git fetch.
     deps_path, deps_content = get_deps(current_dir)
-    gclient_dict = gclient_eval.Parse(deps_content, True, True, deps_path)
+    gclient_dict = gclient_eval.Exec(deps_content, True, True, deps_path)
     is_relative = gclient_dict.get('use_relative_paths', False)
     root_dir = current_dir if is_relative else gclient_root
     rolls = {}