- removed getGeneratorObjectLocation from debugger-script.js,
- one more step to remove all debugger context usages in inspector.

BUG=v8:5510
R=yangguo@chromium.org,jgruber@chromium.org,alph@chromium.org

Review-Url: https://codereview.chromium.org/2678143002
Cr-Commit-Position: refs/heads/master@{#43018}