Revert of Added experiments section and exported the list of SafeBrowsing features in WebUI

Revert of Added experiments section and exported the list of SafeBrowsing features in WebUI (patchset #12 id:220001 of https://codereview.chromium.org/2964693003/ )

Reason for revert:
Introduced new static initializer: https://crbug.com/740955

Original issue's description:
> -Added the experimental features section as part of the chrome://safe-browsing. For the experiments not running at 100%. 
> 
> -Exported the list of SafeBrowsing features (base::Feature) to have them in the future in a central location. 
> 
> -Fixed the message dialogue for the WebUI.
> 
> -Added some extra css.
> 
> Note: Tags for the experiments are not added in this issue.
> Review-Url: https://codereview.chromium.org/2964693003
> Cr-Commit-Position: refs/heads/master@{#485380}
> Committed: https://chromium.googlesource.com/chromium/src/+/fdacb19a2600b6ca47c7d58752a97bc075fd89f5

TBR=jialiul@chromium.org,vakh@chromium.org,blundell@chromium.org,tommycli@chromium.org,pkasting@chromium.org,hkamila@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2974243002
Cr-Commit-Position: refs/heads/master@{#485651}
Committed: https://chromium.googlesource.com/chromium/src/+/74a5941b8bc410ce79a0d6f1ac8faa166e931f5d

[Peter Wen, 2017-07-11 16:39:46]

The CQ bit was checked by wnwen@chromium.org

[Peter Wen, 2017-07-11 16:39:47]

Created Revert of Added experiments section and exported the list of
SafeBrowsing features in WebUI

[commit-bot: I haz the power, 2017-07-11 16:39:56]

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, 2017-07-11 16:40:29]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499791186764130, "parent_rev":
"0efbb839fe6d0864c4b8cf350e013a2f362fc592", "commit_rev":
"db8c1e741ed08b3931817dc5372bb840ffda0767"}

[commit-bot: I haz the power, 2017-07-11 16:40:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499791186764130, "parent_rev":
"200fb6b4542ead0b15c4b6be5f825f64fd1a58ce", "commit_rev":
"74a5941b8bc410ce79a0d6f1ac8faa166e931f5d"}

[commit-bot: I haz the power, 2017-07-11 16:41:02]

Description was changed from

==========
Revert of Added experiments section and exported the list of SafeBrowsing
features in WebUI (patchset #12 id:220001 of
https://codereview.chromium.org/2964693003/ )

Reason for revert:
Introduced new static initializer: https://crbug.com/740955

Original issue's description:
> -Added the experimental features section as part of the
chrome://safe-browsing. For the experiments not running at 100%. 
> 
> -Exported the list of SafeBrowsing features (base::Feature) to have them in
the future in a central location. 
> 
> -Fixed the message dialogue for the WebUI.
> 
> -Added some extra css.
> 
> Note: Tags for the experiments are not added in this issue.
> Review-Url: https://codereview.chromium.org/2964693003
> Cr-Commit-Position: refs/heads/master@{#485380}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fdacb19a2600b6ca47c7d58752a9...

TBR=jialiul@chromium.org,vakh@chromium.org,blundell@chromium.org,tommycli@chr...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of Added experiments section and exported the list of SafeBrowsing
features in WebUI (patchset #12 id:220001 of
https://codereview.chromium.org/2964693003/ )

Reason for revert:
Introduced new static initializer: https://crbug.com/740955

Original issue's description:
> -Added the experimental features section as part of the
chrome://safe-browsing. For the experiments not running at 100%. 
> 
> -Exported the list of SafeBrowsing features (base::Feature) to have them in
the future in a central location. 
> 
> -Fixed the message dialogue for the WebUI.
> 
> -Added some extra css.
> 
> Note: Tags for the experiments are not added in this issue.
> Review-Url: https://codereview.chromium.org/2964693003
> Cr-Commit-Position: refs/heads/master@{#485380}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fdacb19a2600b6ca47c7d58752a9...

TBR=jialiul@chromium.org,vakh@chromium.org,blundell@chromium.org,tommycli@chr...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2974243002
Cr-Commit-Position: refs/heads/master@{#485651}
Committed:
https://chromium.googlesource.com/chromium/src/+/74a5941b8bc410ce79a0d6f1ac8f...
==========

[commit-bot: I haz the power, 2017-07-11 16:41:04]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/74a5941b8bc410ce79a0d6f1ac8f...