Fix bug for the webgl and angle roll-in tools

BUG=657723

Review-Url: https://chromiumcodereview.appspot.com/2435723003
Cr-Commit-Position: refs/heads/master@{#426939}

tools/roll_angle.py

@@ -87,7 +87,6 @@ def _ParseDepsDict(deps_content):
   local_scope = {}
   var = GClientKeywords.VarImpl({}, local_scope)
   global_scope = {
-    'File': GClientKeywords.FileImpl,
     'From': GClientKeywords.FromImpl,
     'Var': var.Lookup,
     'deps_os': {},

tools/roll_webgl_conformance.py

@@ -81,7 +81,6 @@ def _ParseDepsDict(deps_content):
   local_scope = {}
   var = GClientKeywords.VarImpl({}, local_scope)
   global_scope = {
-    'File': GClientKeywords.FileImpl,
     'From': GClientKeywords.FromImpl,
     'Var': var.Lookup,
     'deps_os': {},