Fix closure linker url.
Fix closure linker url.

The Google Closure linter is now moved to
https://github.com/google/closure-linter, and update the steps to follow
new instruction (W/O pip needed).

halton/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,halton/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,jondong/realsense-extensions-crosswalk,crosswalk-project/realsense-extensions-crosswalk,halton/realsense-extensions-crosswalk,halton/realsense-extensions-crosswalk