Revert of CSP: 'self' should work inside sandboxes.

Revert of CSP: 'self' should work inside sandboxes. (patchset #2 id:20001 of https://codereview.chromium.org/2699663002/ )

Reason for revert:
I suspect that this breaks Synology's UI, which submits a form through
an `about:blank` frame. Perhaps we're not persisting the fallback base
URL correctly?

BUG=695058
Original issue's description:
> CSP: 'self' should work inside sandboxes.
> 
> We ought to be looking at the URL of a sandboxed resource when resolving
> the CSP source expression 'self'. Currently, we're looking at the origin
> of the resource, which is generally correct, but fails if the resource
> has been pushed into an opaque origin.
> 
> This patch uses the fallback base URL of a document rather than its
> origin to do the comparison.
> 
> BUG=692475
> R=jochen@chromium.org
> CC=andypaicu@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2699663002
> Cr-Commit-Position: refs/heads/master@{#451626}
> Committed: https://chromium.googlesource.com/chromium/src/+/9d3329c4a3d3dd0ab85869b7de4d62a8e2797520

TBR=jochen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=692475
Review-Url: https://codereview.chromium.org/2711363004
Cr-Commit-Position: refs/heads/master@{#453091}
Committed: https://chromium.googlesource.com/chromium/src/+/3a1bb4d2c8bd64fdf57558d2ff39a5f356597af4

[Mike West, 2017-02-25 13:18:05]

The CQ bit was checked by mkwst@chromium.org

[Mike West, 2017-02-25 13:18:05]

Created Revert of CSP: 'self' should work inside sandboxes.

[commit-bot: I haz the power, 2017-02-25 13:18:19]

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, 2017-02-25 14:45:24]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488028685256360, "parent_rev":
"c5f5f6b86a87487c82e1967fcf523633f43e8f21", "commit_rev":
"3a1bb4d2c8bd64fdf57558d2ff39a5f356597af4"}

[commit-bot: I haz the power, 2017-02-25 14:46:01]

Description was changed from

==========
Revert of CSP: 'self' should work inside sandboxes. (patchset #2 id:20001 of
https://codereview.chromium.org/2699663002/ )

Reason for revert:
I suspect that this breaks Synology's UI, which submits a form through
an `about:blank` frame. Perhaps we're not persisting the fallback base
URL correctly?

BUG=695058

Original issue's description:
> CSP: 'self' should work inside sandboxes.
> 
> We ought to be looking at the URL of a sandboxed resource when resolving
> the CSP source expression 'self'. Currently, we're looking at the origin
> of the resource, which is generally correct, but fails if the resource
> has been pushed into an opaque origin.
> 
> This patch uses the fallback base URL of a document rather than its
> origin to do the comparison.
> 
> BUG=692475
> R=jochen@chromium.org
> CC=andypaicu@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2699663002
> Cr-Commit-Position: refs/heads/master@{#451626}
> Committed:
https://chromium.googlesource.com/chromium/src/+/9d3329c4a3d3dd0ab85869b7de4d...

TBR=jochen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=692475
==========

to

==========
Revert of CSP: 'self' should work inside sandboxes. (patchset #2 id:20001 of
https://codereview.chromium.org/2699663002/ )

Reason for revert:
I suspect that this breaks Synology's UI, which submits a form through
an `about:blank` frame. Perhaps we're not persisting the fallback base
URL correctly?

BUG=695058

Original issue's description:
> CSP: 'self' should work inside sandboxes.
> 
> We ought to be looking at the URL of a sandboxed resource when resolving
> the CSP source expression 'self'. Currently, we're looking at the origin
> of the resource, which is generally correct, but fails if the resource
> has been pushed into an opaque origin.
> 
> This patch uses the fallback base URL of a document rather than its
> origin to do the comparison.
> 
> BUG=692475
> R=jochen@chromium.org
> CC=andypaicu@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2699663002
> Cr-Commit-Position: refs/heads/master@{#451626}
> Committed:
https://chromium.googlesource.com/chromium/src/+/9d3329c4a3d3dd0ab85869b7de4d...

TBR=jochen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=692475

Review-Url: https://codereview.chromium.org/2711363004
Cr-Commit-Position: refs/heads/master@{#453091}
Committed:
https://chromium.googlesource.com/chromium/src/+/3a1bb4d2c8bd64fdf57558d2ff39...
==========

[commit-bot: I haz the power, 2017-02-25 14:46:02]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3a1bb4d2c8bd64fdf57558d2ff39...