Update default to reflect new chromium enlistment layout

[rpaquay]

The default layout of a chromium enlistement has changed quite since the last time the defaults were updated.

See #31 (comment)

Looking at that file I can see other changes which should be made. Now that gn has replaced gyp the explicit references to Debug and Release directories don't make sense. It would be better to replace:

out/Debug/gen/webkit/bindings/
out/Release/gen/webkit/bindings/

with:

out/*/gen/webkit/bindings

except that that directory doesn't exist anymore so that I think what is actually wanted is:

out/*/gen/blink/bindings

---

Note: Source files containing defaults are:

• ChromiumExplorer.ignore
• SearchableFiles.include
• SearchableFiles.ignore

[rpaquay]

Fixed