gn2bp: delete compat.py

gn2bp does not need to support python2.

Test: none
Change-Id: I00223ec3e53bf629342380eadf5f867c333863f6
diff --git a/tools/gn2bp/gn_utils.py b/tools/gn2bp/gn_utils.py
index 91d7a32..7b54213 100644
--- a/tools/gn2bp/gn_utils.py
+++ b/tools/gn2bp/gn_utils.py
@@ -25,7 +25,6 @@
 import shutil
 import subprocess
 import sys
-from compat import iteritems
 
 BUILDFLAGS_TARGET = '//gn:gen_buildflags'
 GEN_VERSION_TARGET = '//src/base:version_gen_h'
@@ -362,7 +361,7 @@
     def __repr__(self):
       return json.dumps({
           k: (list(sorted(v)) if isinstance(v, set) else v)
-          for (k, v) in iteritems(self.__dict__)
+          for (k, v) in self.__dict__.items()
       },
                         indent=4,
                         sort_keys=True)