Revert of Merge Prevent DisplayPreferences from saving incorrect rotations.

Revert of Merge Prevent DisplayPreferences from saving incorrect rotations. (patchset #1 id:1 of https://codereview.chromium.org/1107383002/)

Reason for revert:
Merge issue broke cros build

https://uberchromegw.corp.google.com/i/chrome/builders/cros%20beta/builds/8333

Original issue's description:
> Merge Prevent DisplayPreferences from saving incorrect rotations.
> Refactor DisplayInfo::rotation_ to track different sources of rotations
> 
> Currently DisplayInfo only tracks the active rotation for the given display.
> DisplayPreferences however saves a user rotation, as well as an accelerometer
> rotation. DisplayController::Observer::OnDisplayConfigurationChanged triggers
> the saving of display preferences.
> 
> This has been leading to active accelerometer rotations being saved as user
> preferences, and being re-applied upon reboot.
> 
> This change refactors DisplayInfo to track one rotation per source of rotation
> changes. DisplayPreferences has been updated to save based on these states.
> 
> TEST=DisplayPreferencesTest.DontSaveMaximizeModeControllerRotations, also ran
> ash_unittests, and unit_tests
> BUG=chrome-os-partner:37555, 469752, 466861
> TBR=oshima@chromium.org, mukai@chromium.org, kalman@chromium.org
> NOTRY=true
> NOPRESUBMIT=true
> 
> Review URL: https://codereview.chromium.org/1071353003
> 
> Cr-Commit-Position: refs/heads/master@{#326614}
> (cherry picked from commit d01de7f9b271d29dc1fe9126357a36c5563f0ff0)

TBR=kalman@chromium.org,mukai@chromium.org,oshima@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chrome-os-partner:37555, 469752, 466861

[jonross, 2015-04-28 15:04:23]

Created Revert of Merge Prevent DisplayPreferences from saving incorrect
rotations.

[commit-bot: I haz the power, 2015-04-28 15:04:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1108343002/1

[commit-bot: I haz the power, 2015-04-28 15:05:55]

Committed patchset #1 (id:1)