Revert of Enable ScreenOrientation on ChromeOS

Revert of Enable ScreenOrientation on ChromeOS (patchset #1 id:1 of https://codereview.chromium.org/797093005/)

Reason for revert:
This feature was not approved for release in M-41. Re-disabling it by default.

Original issue's description:
> Enable ScreenOrientation on ChromeOS
>
> Remove the flag blocking ScreenOrientation to enable it by default.
>
> TBR=oshima@chromium.org
> BUG=396760
>
> Committed: https://crrev.com/90cab9cb698467c3a8f0e4bc1020003f7e98d74f
> Cr-Commit-Position: refs/heads/master@{#309086}

TBR=oshima@chromium.org
BUG=396760

Review URL: https://codereview.chromium.org/831153003

Cr-Commit-Position: refs/heads/master@{#310206}

ash/content/display/screen_orientation_delegate_chromeos.cc

@@ -119,7 +119,9 @@ void ScreenOrientationDelegate::Lock(
 bool ScreenOrientationDelegate::ScreenOrientationProviderSupported() {
   return Shell::GetInstance()
              ->maximize_mode_controller()
-             ->IsMaximizeModeWindowManagerEnabled();
+             ->IsMaximizeModeWindowManagerEnabled() &&
+         base::CommandLine::ForCurrentProcess()->HasSwitch(
+             switches::kAshEnableTouchViewTesting);
 }
 
 void ScreenOrientationDelegate::Unlock(content::WebContents* web_contents) {