Some MaybeHandles related cleanups.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 831e0135018a291b06ccd61d17808a74e0e31a2d..42671c39c4f7ef55ca2c2efeb99f38ffdacd1256 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2364,9 +2364,10 @@ class JSObject: public JSReceiver {
 
   // Retrieves an AccessorPair property from the given object. Might return
   // undefined if the property doesn't exist or is of a different kind.
-  static Handle<Object> GetAccessor(Handle<JSObject> object,
-                                    Handle<Name> name,
-                                    AccessorComponent component);
+  MUST_USE_RESULT static MaybeHandle<Object> GetAccessor(
+      Handle<JSObject> object,
+      Handle<Name> name,
+      AccessorComponent component);
 
   // Defines an AccessorPair property on the given object.
   // TODO(mstarzinger): Rename to SetAccessor() and return empty handle on
@@ -2379,8 +2380,9 @@ class JSObject: public JSReceiver {
                              v8::AccessControl access_control = v8::DEFAULT);
 
   // Defines an AccessorInfo property on the given object.
-  static Handle<Object> SetAccessor(Handle<JSObject> object,
-                                    Handle<AccessorInfo> info);
+  MUST_USE_RESULT static MaybeHandle<Object> SetAccessor(
+      Handle<JSObject> object,
+      Handle<AccessorInfo> info);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithInterceptor(
       Handle<JSObject> object,
@@ -2658,7 +2660,8 @@ class JSObject: public JSReceiver {
   bool ReferencesObject(Object* obj);
 
   // Disalow further properties to be added to the object.
-  static Handle<Object> PreventExtensions(Handle<JSObject> object);
+  MUST_USE_RESULT static MaybeHandle<Object> PreventExtensions(
+      Handle<JSObject> object);
 
   // ES5 Object.freeze
   MUST_USE_RESULT static MaybeHandle<Object> Freeze(Handle<JSObject> object);
@@ -2938,8 +2941,9 @@ class JSObject: public JSReceiver {
   static Handle<Object> DeletePropertyPostInterceptor(Handle<JSObject> object,
                                                       Handle<Name> name,
                                                       DeleteMode mode);
-  static Handle<Object> DeletePropertyWithInterceptor(Handle<JSObject> object,
-                                                      Handle<Name> name);
+  MUST_USE_RESULT static MaybeHandle<Object> DeletePropertyWithInterceptor(
+      Handle<JSObject> object,
+      Handle<Name> name);
 
   // Deletes the named property in a normalized object.
   static Handle<Object> DeleteNormalizedProperty(Handle<JSObject> object,