DevTools: simplify NetworkProject.addFileForURL method
The first "url" parameter of NetworkProject.addFileForURL method is not
needed - contentProvider already have associated URL.
As the "url" parameter goes away, this patch also renames
addFileForURL(url, contentProvider, frame) into addFile(contentProvider, frame).
BUG=
610061
R=pfeldman
Committed:
https://crrev.com/ecff28a9f64c5657409fc62bfda4ed5c328581e3
Cr-Commit-Position: refs/heads/master@{#392509}