Fix python scripts in src/tools/

tools/unused-symbols-report.py

Index: tools/unused-symbols-report.py
diff --git a/tools/unused-symbols-report.py b/tools/unused-symbols-report.py
index 12eb05377bf53d8fa11e173a279f7e90c1f14772..900bf16e120b1b0bd8b94647ed5e2464badb933e 100755
--- a/tools/unused-symbols-report.py
+++ b/tools/unused-symbols-report.py
@@ -1,9 +1,9 @@
-#!/usr/bin/python
-# Copyright (c) 2010 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.
 
-"""Print a report of symbols stripped by the linker due to being unused.
+"""Prints a report of symbols stripped by the linker due to being unused.
 
 To use, build with these linker flags:
   -Wl,--gc-sections
@@ -166,5 +166,6 @@ def main():
                only_paths=opts.only_paths)
   Output(iter)
 
+
 if __name__ == '__main__':
   main()