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This reverts commit 0c264842.

The new iframe test is fragile and is not properly waiting for the
iframe onload event. Since the problem is in the test, relanding
without the test for now to unblock other changes.

Original change's description:
> Capture all DOM nodes reachable from V8 in heap snapshot.
>
> This patch uses the new EmbedderGraph API to provide the heap snapshot
> generator with all DOM nodes and references reachable from V8.
>
> Bug: 749490
> Change-Id: I26750a8b80dab4f88508e504b431d976a598c6c3
> Reviewed-on: https://chromium-review.googlesource.com/890260
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Alexei Filippov <alph@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>

Change-Id: I1d736a74b2f39443c490aecbfe7f6d305a669711

TBR=haraken@chromium.org,alph@chromium.org

Change-Id: I1d736a74b2f39443c490aecbfe7f6d305a669711
Reviewed-on: https://chromium-review.googlesource.com/897644
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533831}