Convert all remaining Python 2 scripts to Python 3 (flutter#495)

This applies all remaining migrations in the buildroot, and converts the
hashbang lines to invoke python3.

Author: cbracken

build/android/gyp/create_flutter_jar.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

build/android/gyp/jar.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -48,8 +48,7 @@ def Jar(class_files, classes_dir, jar_path, manifest_file=None, additional_jar_f
 def JarDirectory(classes_dir, excluded_classes, jar_path, manifest_file=None, additional_jar_files=None):
   class_files = build_utils.FindInDirectory(classes_dir, '*.class')
   for exclude in excluded_classes:
-    class_files = filter(
-        lambda f: not fnmatch.fnmatch(f, exclude), class_files)
+    class_files = [f for f in class_files if not fnmatch.fnmatch(f, exclude)]
 
   Jar(class_files, classes_dir, jar_path, manifest_file=manifest_file,
       additional_jar_files=additional_jar_files)

build/android/gyp/javac.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
@@ -301,7 +301,7 @@ def main(argv):
     if options.jar_path:
       if options.main_class or options.manifest_entry:
         if options.manifest_entry:
-          entries = map(lambda e: e.split(":"), options.manifest_entry)
+          entries = [e.split(":") for e in options.manifest_entry]
         else:
           entries = []
         manifest_file = os.path.join(temp_dir, 'manifest')

build/apply_locales.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/check_return_value.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/check_sdk_extras_version.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/clobber.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/compiler_version.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/config/linux/pkg-config.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+#
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

build/config/mac/mac_app.py

@@ -1,4 +1,5 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
+#
 # Copyright (c) 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.