Fix issue 46 (set feature dependencies)
Fix issue 46 (set feature dependencies)

Review URL: http://codereview.chromium.org/7336005
vpupkin/chromedevtools,AlexRee/chromedevtools,AlexRee/chromedevtools,vpupkin/chromedevtools,ericmckean/chromedevtools,ericmckean/chromedevtools,vpupkin/chromedevtools,vpupkin/chromedevtools,ericmckean/chromedevtools,AlexRee/chromedevtools,AlexRee/chromedevtools,AlexRee/chromedevtools,ericmckean/chromedevtools,ericmckean/chromedevtools,vpupkin/chromedevtools