Oilpan: move InspectorOverlay to the heap.

Thereby avoiding its Persistent references.

R=haraken
BUG=340522

Review URL: https://codereview.chromium.org/783923005

git-svn-id: svn://svn.chromium.org/blink/trunk@186935 bbb929c8-8fbe-4397-9dbb-9b2b20218538
4 files changed
tree: 78f7390a5e80e58a81f22be2670b79d33ac89398
  1. third_party/