Remove trailing whitespace.

Also adds a presubmit to prevent adding trailing whitespace to source
code in the future.

Change-Id: I41a4df81487f6f00aa19b188f0cac6a3377efde6
Reviewed-on: https://skia-review.googlesource.com/57380
Reviewed-by: Ravi Mistry <rmistry@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/tools/mirror-dev.sh b/tools/mirror-dev.sh
index 0512a78..eb948f4 100755
--- a/tools/mirror-dev.sh
+++ b/tools/mirror-dev.sh
@@ -1,3 +1,7 @@
+# Copyright 2013 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
  # For each installed *-dev package DEV
  for DEV in $(dpkg --list | grep '^ii  [^ ]' | cut -d ' ' -f 3 | grep '\-dev$')
  do
@@ -10,14 +14,14 @@
             echo "$DEV installed $DEV_64_SO which is real."
             continue
         fi
- 
+
         DEV_64_TARGET=$(readlink $DEV_64_SO)
-        DEV_64_TARGET_FULL=$(readlink -f $DEV_64_SO) 
- 
+        DEV_64_TARGET_FULL=$(readlink -f $DEV_64_SO)
+
         DEV_32_SO=$(echo $DEV_64_SO | sed -e 's@/lib/x86_64-linux-gnu/@/lib/i386-linux-gnu/@')
         DEV_32_TARGET=$(echo $DEV_64_TARGET | sed -e 's@/lib/x86_64-linux-gnu/@/lib/i386-linux-gnu/@')
         DEV_32_TARGET_FULL=$(echo $DEV_64_TARGET_FULL | sed -e 's@/lib/x86_64-linux-gnu/@/lib/i386-linux-gnu/@')
- 
+
         # Error if DEV_32_TARGET does not exist.
         if ! test -e $DEV_32_TARGET_FULL
         then
@@ -27,7 +31,7 @@
             #echo "   $DEV_32_SO -> $DEV_32_TARGET ($DEV_32_TARGET_FULL)"
             continue
         fi
- 
+
         # Create DEV_32_SO
         sudo ln -s $DEV_32_TARGET $DEV_32_SO
      done