Speculative fix for codec errors

This fix seems to have worked for //build/config/ios/codesign.py. Try
applying this fix to plist_util.py. See bug for more details.

Bug: 1005190
Change-Id: I0858a521ae5027f9d2c09a25f32961490dcd9eb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809893Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697784}

build/config/mac/plist_util.py

@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import argparse
+import codecs
 import plistlib
 import os
 import re
@@ -212,6 +213,10 @@ class SubstituteAction(Action):
 
 
 def Main():
+  # Cache this codec so that plistlib can find it. See
+  # https://crbug.com/1005190#c2 for more details.
+  codecs.lookup('utf-8')
+
   parser = argparse.ArgumentParser(description='manipulate plist files')
   subparsers = parser.add_subparsers()