Remove deadcode from depot_tools scripts

Removing some deadcode from depot_tools scripts. More follow-up CLs will
be made after this to remove more dead code.

R=sokcevic,gavinmak

Change-Id: Iad20e9e1737e49c1370248d32c6317cf2be63de4
Bug: 1475776
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4811216
Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
diff --git a/gclient.py b/gclient.py
index 8afbcf4..eb8a25e 100755
--- a/gclient.py
+++ b/gclient.py
@@ -128,12 +128,8 @@
   pass
 
 
-def ToGNString(value, allow_dicts = True):
-  """Returns a stringified GN equivalent of the Python value.
-
-  allow_dicts indicates if this function will allow converting dictionaries
-  to GN scopes. This is only possible at the top level, you can't nest a
-  GN scope in a list, so this should be set to False for recursive calls."""
+def ToGNString(value):
+  """Returns a stringified GN equivalent of the Python value."""
   if isinstance(value, str):
     if value.find('\n') >= 0:
       raise GNException("Trying to print a string with a newline in it.")