Revert "Reland "[CCA] Run CCA as SWA by default""

This reverts commit 074c395f.

Reason for revert:

This patch landed in https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/21376, where three ~related `browser_test` items began failing consistently:

* SystemFeaturesPolicyTest.DisableCameraAfterInstall
* SystemFeaturesPolicyTest.DisableCameraBeforeInstall
* ExtensionPolicyTest.ExtensionInstallBlocklistComponentApps

These failures are really verbose, but it looks like the core is:

```
../../chrome/browser/policy/extension_policy_browsertest.cc:401: Failure
Value of: registry->enabled_extensions().GetByID(extension_misc::kCameraAppId)
  Actual: false
Expected: true
```



Original change's description:
> Reland "[CCA] Run CCA as SWA by default"
>
> This reverts commit 5dec0310.
>
> Reason for revert: LKGM update: crbug.com/1148527
>
> Original change's description:
> > Revert "[CCA] Run CCA as SWA by default"
> >
> > This reverts commit 46b6fd15.
> >
> > Reason for revert:
> >
> > camera.CCAUISmoke.fake is failing on chromeos-eve-chrome and camera.CCAUI* is listed as test coverage for this CL, so I am speculating that it is the cause. See:
> > https://ci.chromium.org/p/chrome/builders/ci/chromeos-eve-chrome/11136
> >
> > Original change's description:
> > > [CCA] Run CCA as SWA by default
> > >
> > > Bug: b/172345161
> > > Test: tast run [DUT] camera.CCAUI*
> > > Change-Id: I10484c9263f3e4c560028aef272cd3db88c47b31
> > > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509834
> > > Commit-Queue: Wei Lee <wtlee@chromium.org>
> > > Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> > > Auto-Submit: Wei Lee <wtlee@chromium.org>
> > > Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#825657}
> >
> > TBR=ortuno@chromium.org,wtlee@chromium.org
> >
> > Change-Id: I5464fbcd7f1a03cd157122ad66c6ee13ad111630
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: b/172345161
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529360
> > Reviewed-by: Henrik Boström <hbos@chromium.org>
> > Commit-Queue: Henrik Boström <hbos@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#825818}
>
> TBR=hbos@chromium.org,ortuno@chromium.org,wtlee@chromium.org
>
> Bug: b/172345161
> Change-Id: Ie6d18656a2b247d8eec260319594e7355337c5af
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547645
> Reviewed-by: Wei Lee <wtlee@chromium.org>
> Reviewed-by: Shik Chen <shik@chromium.org>
> Commit-Queue: Wei Lee <wtlee@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#829079}

TBR=shik@chromium.org,hbos@chromium.org,ortuno@chromium.org,wtlee@chromium.org

Change-Id: I31ad4e34332a5c54a0a4bd2c2f98dfe7e6544016
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/172345161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549842Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829154}

chromeos/constants/chromeos_features.cc

@@ -157,7 +157,7 @@ const base::Feature kBluetoothPhoneFilter{"BluetoothPhoneFilter",
 
 // Enable or disables running the Camera App as a System Web App.
 const base::Feature kCameraSystemWebApp{"CameraSystemWebApp",
-                                        base::FEATURE_ENABLED_BY_DEFAULT};
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
 
 // If enabled, will use the CDM in the Chrome OS daemon rather than loading the
 // CDM using the library CDM interface.