kiosk: Add kiosk.always_update manifest key

extensions/common/manifest_constants.h

Index: extensions/common/manifest_constants.h
diff --git a/extensions/common/manifest_constants.h b/extensions/common/manifest_constants.h
index 64ac2fdaf7f4d7dc09e40ef7a490bc581b3cb199..f6a206c5de4d0f99854296f0f3f35806414b61e4 100644
--- a/extensions/common/manifest_constants.h
+++ b/extensions/common/manifest_constants.h
@@ -72,6 +72,7 @@ extern const char kJs[];
 extern const char kKey[];
 extern const char kKeycode[];
 extern const char kKiosk[];
+extern const char kKioskAlwaysUpdate[];
 extern const char kKioskEnabled[];
 extern const char kKioskOnly[];
 extern const char kKioskMode[];
@@ -132,7 +133,6 @@ extern const char kPluginsPath[];
 extern const char kPluginsPublic[];
 extern const char kPublicKey[];
 extern const char kRemoveButton[];
-extern const char kRequiredPlatformVersion[];
 extern const char kRequirements[];
 extern const char kRunAt[];
 extern const char kSandboxedPages[];
@@ -357,6 +357,7 @@ extern const char kInvalidKeyBindingMediaKeyWithModifier[];
 extern const char kInvalidKeyBindingMissingPlatform[];
 extern const char kInvalidKeyBindingTooMany[];
 extern const char kInvalidKeyBindingUnknownPlatform[];
+extern const char kInvalidKioskAlwaysUpdate[];
 extern const char kInvalidKioskEnabled[];
 extern const char kInvalidKioskOnly[];
 extern const char kInvalidKioskOnlyButNotEnabled[];