Revert of Add tools/boilerplate.py that will generate files with copyright headers and guards. (https://codereview.chromium.org/199003003/)

Reason for revert:
check_licenses failed:

/b/build/slave/Android_Builder__dbg_/build/src/android_webview/tools/webview_licenses.py scan

The following files contain a third-party license but are not in a listed third-party directory and are not whitelisted. You must add the following files to the whitelist.
tools/boilerplate.py


Original issue's description:
> Add tools/boilerplate.py that will generate files with copyright headers and guards.
> 
> TEST=tools/boilerplate.py chrome/browser/ui/cocoa/test.{h,mm}
> R=thakis@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=256928

TBR=thakis@chromium.org,rsesek@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/199363005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256941 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256941