set sample-webkit to use same build-tools as other sample projects
set sample-webkit to use same build-tools as other sample projects

This should fix this error:
The SDK Build Tools revision (24.0.1) is too low for project
 ':sample-webkit'. Minimum required is 25.0.0

eighthave/NetCipher,guardianproject/NetCipher,guardianproject/NetCipher,eighthave/NetCipher