HeapProfiler: remove obsolete AddImplicitReferences

it hasn't been used since r149579. More than one year ago.

BUG=
R=marja@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/505983002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix and re-enable test-api/InitializeAndDispose.

R=svenpanne@chromium.org
TEST=cctest/test-api/InitializeAndDispose

Review URL: https://codereview.chromium.org/504093002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23401 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Introduce subclass wrappers for STL containers that make them a lot easier
to use with Zone. For example, subclasses add constructors that wrap a Zone
in a zone_allocator to save clients this verbosity.

R=bmeurer@chromium.org, mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/505133003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00