Fix python scripts in src/build/

Make sure that:
- shebang is only present for executable files
- shebang is #!/usr/bin/env python
- __main__ is only present for executable files
- file's executable bit is coherent

Also fix EOF LF to be only one.

[email protected]
BUG=105108
TEST=

Review URL: http://codereview.chromium.org/8667008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111385 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/compiler_version.py b/build/compiler_version.py
index 69f0a50b..9132261 100755
--- a/build/compiler_version.py
+++ b/build/compiler_version.py
@@ -1,6 +1,5 @@
-#!/usr/bin/python
-
-# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+#!/usr/bin/env python
+# Copyright (c) 2011 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.