grit: fix long handling with Python 3

We need to convert numeric strings ids into numbers, but the integer
is too large for int() on Python 2.  Add an alias for long=int so we
can keep using long() in both environments.

Bug: 983071
Test: `./grit/test_suite_all.py` passes
Change-Id: Ied5c18f457e4ee499f5697f54621eb72fe15f7d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700481
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677107}

tools/grit/grit/node/misc.py

@@ -21,6 +21,14 @@ from grit.node import message
 from grit.node import node_io
 
 
+# Python 3 doesn't have long() as int() works everywhere.  But we really do need
+# the long() behavior on Python 2 as our ids are much too large for int().
+try:
+  long
+except NameError:
+  long = int
+
+
 # RTL languages
 # TODO(jennyz): remove this fixed set of RTL language array
 # now that generic expand_variable code exists.