Fix error message for Object.observe accept argument

BUG=chromium:464695
LOG=n

Review URL: https://codereview.chromium.org/1005553003

Cr-Commit-Position: refs/heads/master@{#27171}

src/messages.js

@@ -81,7 +81,7 @@ var kMessages = {
   observe_non_object:            ["Object.", "%0", " cannot ", "%0", " non-object"],
   observe_non_function:          ["Object.", "%0", " cannot deliver to non-function"],
   observe_callback_frozen:       ["Object.observe cannot deliver to a frozen function object"],
-  observe_invalid_accept:        ["Object.observe accept must be an array of strings."],
+  observe_invalid_accept:        ["Third argument to Object.observe must be an array of strings."],
   observe_type_non_string:       ["Invalid changeRecord with non-string 'type' property"],
   observe_perform_non_string:    ["Invalid non-string changeType"],
   observe_perform_non_function:  ["Cannot perform non-function"],

src/object-observe.js

@@ -271,7 +271,7 @@ function ConvertAcceptListToTypeMap(arg) {
     return arg;
 
   if (!IS_SPEC_OBJECT(arg))
-    throw MakeTypeError("observe_accept_invalid");
+    throw MakeTypeError("observe_invalid_accept");
 
   var len = ToInteger(arg.length);
   if (len < 0) len = 0;

test/mjsunit/es7/object-observe.js

@@ -1824,3 +1824,16 @@ for (var b1 = 0; b1 < 2; ++b1)
     { object: fun, type: 'add', name: 'name' },
   ]);
 })();
+
+
+(function TestObserveInvalidAcceptMessage() {
+  var ex;
+  try {
+    Object.observe({}, function(){}, "not an object");
+  } catch (e) {
+    ex = e;
+  }
+  assertInstanceof(ex, TypeError);
+  assertEquals("Third argument to Object.observe must be an array of strings.",
+               ex.message);
+})()