Revert of Add tests to ensure no RFH/RVH objects leak on cross-process navigation

Revert of Add tests to ensure no RFH/RVH objects leak on cross-process navigation (patchset #2 id:20001 of https://codereview.chromium.org/1145073004/)

Reason for revert:
Still causes failures, on both Mac and Win8 Aura

https://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests/builds/2165/steps/content_browsertests%20on%20Mac-10.9/logs/RenderFrameHostManagerTest.CleanupOnCrossProcessNavigation

Original issue's description:
> Add tests to ensure no RFH/RVH objects leak on cross-process navigation
>
> These tests were written as part of https://codereview.chromium.org/1150793002/
> which failed on Win8 Aura. Splitting only the test into a separate CL
> so it can be committed independently.
>
> BUG=357747
>
> Committed: https://crrev.com/30663b189dafe37e6dd94f73a1d88d9efe8fe787
> Cr-Commit-Position: refs/heads/master@{#331138}

TBR=creis@chromium.org,nasko@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=357747
Committed: https://crrev.com/13ab9e08366bd255c00f2a5b23a9e75933ec1dd7
Cr-Commit-Position: refs/heads/master@{#331163}

[Steven Holte, 2015-05-22 20:02:39]

Created Revert of Add tests to ensure no RFH/RVH objects leak on cross-process
navigation

[commit-bot: I haz the power, 2015-05-22 20:04:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149883003/1

[commit-bot: I haz the power, 2015-05-22 20:06:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-22 20:08:40]

Patchset 1 (id:??) landed as
https://crrev.com/13ab9e08366bd255c00f2a5b23a9e75933ec1dd7
Cr-Commit-Position: refs/heads/master@{#331163}