change my webkit icon

com.visnup.icons.chrome.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" \
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<dict>
  <key>Label</key>
  <string>com.visnup.icons.chrome</string>
  <key>LowPriorityIO</key>
  <true/>
  <key>Program</key>
  <string>/Users/visnup/Play/webkit_icon/icon.sh</string>
  <key>ProgramArguments</key>
  <array>
    <string>Google Chrome</string>
    <string>app</string>
  </array>
  <key>WatchPaths</key>
  <array>
  <string>/Applications/Google Chrome.app</string>
  </array>
</dict>
</plist>

com.visnup.icons.webkit.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" \
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<dict>
  <key>Label</key>
  <string>com.visnup.icons.webkit</string>
  <key>LowPriorityIO</key>
  <true/>
  <key>Program</key>
  <string>/Users/visnup/Play/webkit_icon/icon.sh</string>
  <key>ProgramArguments</key>
  <array>
    <string>WebKit</string>
    <string>webkit</string>
  </array>
  <key>WatchPaths</key>
  <array>
  <string>/Applications/WebKit.app</string>
  </array>
</dict>
</plist>

Google Chrome.icns

icon.sh

#!/bin/bash

name=${1:-WebKit}
icns=${2:-webkit}

dir=$(dirname $0)
icon="$dir/$name.icns"

app_dir="/Applications/$name.app/Contents/Resources"
app_backup="$app_dir/$icns.icns.backup"
app_icon="$app_dir/$icns.icns"

[ -e $app_backup ] || mv $app_icon $app_backup
cp $icon $app_icon

touch $app_dir

WebKit.icns