Revert of Telemetry: Refactor inspector_websocket to create cleaner interface.

Revert of Telemetry: Refactor inspector_websocket to create cleaner interface. (patchset #2 id:80001 of https://codereview.chromium.org/942113004/)

Reason for revert:
This possibly is causing chrome tracing data leakage: BUG=461874
Original issue's description:
> Telemetry: Refactor inspector_websocket to create cleaner interface.
>
> This CL contains several improvements which are tightly coupled.
>  - The method DispatchNotificationsUntilDone is only used by tracing_backend. I
>  moved all the logic into tracing_backend. This has several side effects:
>    - The exception DispatchNotificationsUntilDone is no longer needed.
>    - The method _Receive no longer handles exceptions. It used to handle some,
>    but not all exceptions. This change is very important for sane exception
>    handling of the Chrome/Telemetry bindings.
>    - The method _HandleNotification never has a return value. It used to
>    sometimes return a boolean, and sometimes return nothing.
>  - I removed the member _error_handler. This member was only used in two
>  places: inspector_backend and tracing_backend. Of these two places,
>  tracing_backend only used it to emit a not-so-useful log statement.
>    - The biggest problem with _error_handler is that it decouples the exception
>    handling from the context of the try/catch loop that triggered the
>    exception.
>    - The _error_handler only was called during _Receive(). This is very
>    confusing, since that is not the only method that raises Exceptions. So some
>    exceptions get handled by _error_handler, and some do not. :(
>  - I removed all exception handling from inspector_page.py and
>  inspector_websocket.py. It used to be that some exceptions would be handled in
>  inspector_websocket, some would trickle up to inspector_page, and some would
>  trickle out past inspector_backend.py. The eventual goal is for
>  inspector_backend to catch all exceptions and translate them into
>  {Recoverable/Unrecoverable}Exceptions.
>
> BUG=460625
>
> Committed: https://crrev.com/64cf2ab4a6a348954d46d9d758c5be53aa1c1220
> Cr-Commit-Position: refs/heads/master@{#317972}

TBR=sullivan@chromium.org,slamm@chromium.org,erikchen@chromium.org
BUG=460625
Committed: https://crrev.com/179e300754aeda5ffeae3ed165324b2913487dd5
Cr-Commit-Position: refs/heads/master@{#318205}

[nednguyen, 2015-02-26 02:13:58]

Created Revert of Telemetry: Refactor inspector_websocket to create cleaner
interface.

[nednguyen, 2015-02-26 02:14:02]

The CQ bit was unchecked by nednguyen@google.com

[nednguyen, 2015-02-26 02:14:43]

The CQ bit was checked by nednguyen@google.com

[erikchen, 2015-02-26 02:15:36]

lgtm

[commit-bot: I haz the power, 2015-02-26 02:15:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/962443002/1

[commit-bot: I haz the power, 2015-02-26 07:17:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-26 07:18:03]

Patchset 1 (id:??) landed as
https://crrev.com/179e300754aeda5ffeae3ed165324b2913487dd5
Cr-Commit-Position: refs/heads/master@{#318205}