Revert of DevTools: Add icons to performance pane tabs.

Revert of DevTools: Add icons to performance pane tabs. (patchset #1 id:1 of https://codereview.chromium.org/2689213012/ )

Reason for revert:
Per UX folks request

Original issue's description:
> DevTools: Add icons to performance pane tabs.
> 
> BUG=693238
> 
> Review-Url: https://codereview.chromium.org/2689213012
> Cr-Commit-Position: refs/heads/master@{#451321}
> Committed: https://chromium.googlesource.com/chromium/src/+/8376a0c3554ffb329e74e899f4277f7a80b52448

TBR=paulirish@chromium.org,caseq@chromium.org,kozyatinskiy@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=693238
Review-Url: https://codereview.chromium.org/2714923002
Cr-Commit-Position: refs/heads/master@{#452752}
Committed: https://chromium.googlesource.com/chromium/src/+/ef6b4af47205610ad1b96c0da151e7d68881826e

[alph, 2017-02-24 02:53:15]

The CQ bit was checked by alph@chromium.org

[alph, 2017-02-24 02:53:16]

Created Revert of DevTools: Add icons to performance pane tabs.

[commit-bot: I haz the power, 2017-02-24 02:53:42]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-24 04:42:15]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487904795767160, "parent_rev":
"6f6b5f5d3b4667220e1eae213c7d0377e3e78e0f", "commit_rev":
"ef6b4af47205610ad1b96c0da151e7d68881826e"}

[commit-bot: I haz the power, 2017-02-24 04:43:17]

Description was changed from

==========
Revert of DevTools: Add icons to performance pane tabs. (patchset #1 id:1 of
https://codereview.chromium.org/2689213012/ )

Reason for revert:
Per UX folks request

Original issue's description:
> DevTools: Add icons to performance pane tabs.
> 
> BUG=693238
> 
> Review-Url: https://codereview.chromium.org/2689213012
> Cr-Commit-Position: refs/heads/master@{#451321}
> Committed:
https://chromium.googlesource.com/chromium/src/+/8376a0c3554ffb329e74e899f427...

TBR=paulirish@chromium.org,caseq@chromium.org,kozyatinskiy@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=693238
==========

to

==========
Revert of DevTools: Add icons to performance pane tabs. (patchset #1 id:1 of
https://codereview.chromium.org/2689213012/ )

Reason for revert:
Per UX folks request

Original issue's description:
> DevTools: Add icons to performance pane tabs.
> 
> BUG=693238
> 
> Review-Url: https://codereview.chromium.org/2689213012
> Cr-Commit-Position: refs/heads/master@{#451321}
> Committed:
https://chromium.googlesource.com/chromium/src/+/8376a0c3554ffb329e74e899f427...

TBR=paulirish@chromium.org,caseq@chromium.org,kozyatinskiy@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=693238

Review-Url: https://codereview.chromium.org/2714923002
Cr-Commit-Position: refs/heads/master@{#452752}
Committed:
https://chromium.googlesource.com/chromium/src/+/ef6b4af47205610ad1b96c0da151...
==========

[commit-bot: I haz the power, 2017-02-24 04:43:18]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/ef6b4af47205610ad1b96c0da151...