Have WebView Implementation Dev Setting use DefaultAppPickerFragment.

Make the WebView Implementation Dev Setting look like the fullscreen
settings deriving from DefaultAppPickerFragment.
Point the Activity opened through Settings.ACTION_WEBVIEW_SETTINGS to
the class WebViewAppPicker which is our new implementation of the
WebView Implementation setting.

Ensure the new setting closes if it is reached from a user that isn't an
admin of the device.

Bug: 34806477
Bug: 34966439
Test: Ensure WebView implementation Dev Setting looks ok (disabled
packages should have a text showing why they cannot be chosen).
Test: Start Intent with action Settings.ACTION_WEBVIEW_SETTINGS and
ensure the started Activity looks similar to the WebView Implementation
Dev Setting.
Test: Ensure picking a package that is no longer active, updates the
setting (so that package isn't visible anymore).
Change-Id: I08007c515193739ad61dfd735bb5130fc07bd6e6

src/com/android/settings/Settings.java

@@ -164,6 +164,7 @@ public class Settings extends SettingsActivity {
     public static class WifiAPITestActivity extends SettingsActivity { /* empty */ }
     public static class WifiInfoActivity extends SettingsActivity { /* empty */ }
     public static class EnterprisePrivacySettingsActivity extends SettingsActivity { /* empty */ }
+    public static class WebViewAppPickerActivity extends SettingsActivity { /* empty */ }
 
     // Categories.
     public static class WirelessSettings extends SettingsActivity { /* empty */ }