Remove the ReturnUnsafeHandle parameter from v8String.

After https://codereview.chromium.org/18336004/ , this parameter is never
passed, so we can just always return a local handle. This CL contains no
functional change, just dead parameter removal.

BUG=236290

Review URL: https://chromiumcodereview.appspot.com/18106005

git-svn-id: svn://svn.chromium.org/blink/trunk@154209 bbb929c8-8fbe-4397-9dbb-9b2b20218538
These functions were used in earlier DumpRenderTree mac port of WebKit project.
Please refer to <https://trac.webkit.org/changeset/19364> for details.

As DumpRenderTree has been removed in chromium project, these functions can be removed.
So this patch deletes those.

Review URL: https://chromiumcodereview.appspot.com/18097008

git-svn-id: svn://svn.chromium.org/blink/trunk@154211 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Corrupted snapshot makes inspector unresponsive

_buildPostOrderIndex enters infinite loop trying to print retainers
for nodes that have no retainers. That is now fixed.
Also make _buildPostOrderIndex to give out postorder numbers
to orphan nodes, so the snapshot parsing could proceed further.

R=yurys@chromium.org

Review URL: https://codereview.chromium.org/18428006

git-svn-id: svn://svn.chromium.org/blink/trunk@154212 bbb929c8-8fbe-4397-9dbb-9b2b20218538