Build fix after r173654

The change https://codereview.chromium.org/270553005/ doesn't update
inspector.html after moving TracingModel.js. This breaks devtools_frontend_resources
target

BUG=361045
TBR=yurys@chromium.org

Review URL: https://codereview.chromium.org/267363011

git-svn-id: svn://svn.chromium.org/blink/trunk@173655 bbb929c8-8fbe-4397-9dbb-9b2b20218538