[devtools] Enable test debug-inlined-scripts.

Reduce the coverage of the LayoutTest for debugging inline scripts
and re-enable it.

BUG=309677
TBR=pfeldman

Review URL: https://codereview.chromium.org/33093002

git-svn-id: svn://svn.chromium.org/blink/trunk@160462 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Display CommandLineAPI function signatures in DevTools console.

Instead of showing "function $x() { [Command Line API] }"
we'll show: "function $x(xpath, [startNode]) { [Command Line API] }"

BUG=307944
R=pfeldman

Review URL: https://codereview.chromium.org/40343002

git-svn-id: svn://svn.chromium.org/blink/trunk@160463 bbb929c8-8fbe-4397-9dbb-9b2b20218538