Revert of [Contextual Search] Improve testing & add regressions tests

Revert of [Contextual Search] Improve testing & add regressions tests (patchset #4 id:50001 of https://codereview.chromium.org/1426683005/ )

Reason for revert:
Adds a very flaky test.

BUG=549805
Original issue's description:
> [Contextual Search] Improve testing & add regressions tests
>
> This CL adds tests for regressions that have been fixed
> recently, some of them involving ContentViewCore.
>
> In order to be able to properly instrument the ContentViewCore,
> changes in the testing framework have been made. There are now
> a couple of wrapper classes: OverlayPanelContentWrapper and
> ContentViewCoreWrapper, which allow us to test for example
> if the onShow() method was ever called, or if URLs have been
> properly removed from local history when not seen.
>
> This CL also introduces a few more helpers to simulate searches
> caused by gestures (long press and tap) in a way that it
> encapsulates the simulation logic and prevent flakiness. We
> were manually doing a search term resolution by calling a
> fakeResponse() method. Sometimes we are calling this when
> not necessary (on long press) and tests don't call it in the
> same order. We are also assuming it completed when the Bar
> peeks (which works but under the wrong assumption). There are
> now simulateLongPressSearch(id) and simulateTapSearch(id)
> methods that simulate the search and handle the resolution
> automatically when the system requests one.
>
> There are several helper methods in ContextualSearchManagerTest
> that are similar but do slightly different things, and some
> assumptions are not quite correct which can and may be causing
> falkiness in some tests. A couple of examples are: tests rely
> on the change of state of the Panel in order to determine that
> animations/actions are done. The closed state was being changed
> before destroying the Contents. This is now fixed.
>
> Another example is the tapBasePageToClosePanel() helper method
> that wasn't properly working when the Panel was peeking while
> a long press selection is present. I believe this is the cause
> of the flakiness of 3 of our tests.
>
> The new search simulation method should help making our tests
> more robust and a followup CL is required to change existing
> tests to use the new methods, once it has been confirmed that
> the new methods work properly on existing test bots.
>
> BUG=543319
>
> Committed: https://crrev.com/7e0c3b88ed5970327b2aa7962a1bc336b71bc427
> Cr-Commit-Position: refs/heads/master@{#357143}

TBR=aurimas@chromium.org,donnd@chromium.org,dtrainor@chromium.org,dfalcantara@chromium.org,pedrosimonetti@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=543319
Committed: https://crrev.com/d6d3bcb62ad798ee56ffef7429f990d4a1e23ef4
Cr-Commit-Position: refs/heads/master@{#357278}

[jam, 2015-10-31 18:22:27]

Created Revert of [Contextual Search] Improve testing & add regressions tests

[commit-bot: I haz the power, 2015-10-31 18:22:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413383007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413383007/1

[commit-bot: I haz the power, 2015-10-31 18:23:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-31 18:24:23]

Patchset 1 (id:??) landed as
https://crrev.com/d6d3bcb62ad798ee56ffef7429f990d4a1e23ef4
Cr-Commit-Position: refs/heads/master@{#357278}