Revert of Add custom tabs tests using intents with non-null sessions

Revert of Add custom tabs tests using intents with non-null sessions (patchset #3 id:40001 of https://codereview.chromium.org/1267243003/ )

Reason for revert:
Test flaking on dowsntream ToT due to deferred startup not finishing.

Original issue's description:
> Add custom tabs tests using intents with non-null sessions
>
> All current tests either test the service side session creation without
> launching intents or the UI customization with no sessions. This change
> add a trivial test that uses a valid session to launch an intent and also
> another more complex test that reloads a new URL in the same tab when the
> same session is used inside the intent.
>
> Note that the service side is interfaced directly through CustomTabConnection
> and this doesn't exactly replicate the actual scenario since all calls come
> from the same process.
>
> Committed: https://crrev.com/a69c3f7ba69a30aef2143945b8b2bbf8e6421080
> Cr-Commit-Position: refs/heads/master@{#342131}

TBR=newt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/62bfb371d47b91bd0a328965af87e6f35ca95a42
Cr-Commit-Position: refs/heads/master@{#342169}

[Yusuf, 2015-08-06 19:04:29]

Created Revert of Add custom tabs tests using intents with non-null sessions

[commit-bot: I haz the power, 2015-08-06 19:04:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1276993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1276993002/1

[Yusuf, 2015-08-06 19:05:06]

yusufo@chromium.org changed reviewers:
+ twellington@chromium.org

[commit-bot: I haz the power, 2015-08-06 19:06:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-06 19:07:18]

Patchset 1 (id:??) landed as
https://crrev.com/62bfb371d47b91bd0a328965af87e6f35ca95a42
Cr-Commit-Position: refs/heads/master@{#342169}