Rename WEB_ACTION_ENABLED to INSTANT_APPS_ENABLED

Renames the instant apps setting to reflect what it is for.

Adds the SystemApi annotation to make this field visible
to the resolver and installer.

Test: existing tests

Change-Id: I1651bb101d69bdfdaa63c004435025c68a33cd8e
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
index 4a54c0e..bac694f 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
@@ -1435,8 +1435,8 @@
                 Settings.Secure.DEMO_USER_SETUP_COMPLETE,
                 SecureSettingsProto.DEMO_USER_SETUP_COMPLETE);
         dumpSetting(s, p,
-                Settings.Secure.WEB_ACTION_ENABLED,
-                SecureSettingsProto.WEB_ACTION_ENABLED);
+                Settings.Secure.INSTANT_APPS_ENABLED,
+                SecureSettingsProto.INSTANT_APPS_ENABLED);
         dumpSetting(s, p,
                 Settings.Secure.DEVICE_PAIRED,
                 SecureSettingsProto.DEVICE_PAIRED);