Improve handling of dictionary conversions.

LayoutTests/fast/events/constructors/ui-event-constructor.html

Index: LayoutTests/fast/events/constructors/ui-event-constructor.html
diff --git a/LayoutTests/fast/events/constructors/ui-event-constructor.html b/LayoutTests/fast/events/constructors/ui-event-constructor.html
index 2b2169f30be003a4f5e9d51b0dd730c91908bcf7..03f8b5b2e27c368c6d171d881b180cc3034374b5 100644
--- a/LayoutTests/fast/events/constructors/ui-event-constructor.html
+++ b/LayoutTests/fast/events/constructors/ui-event-constructor.html
@@ -30,20 +30,21 @@ shouldBe("new UIEvent('eventType', { view: window }).view", "window");
 shouldBe("new UIEvent('eventType', { view: this }).view", "this");
 
 // Non-window objects.
-shouldBe("new UIEvent('eventType', { view: testObject }).view", "null");
-shouldBe("new UIEvent('eventType', { view: document }).view", "null");
+shouldThrow("new UIEvent('eventType', { view: testObject }).view");
+shouldThrow("new UIEvent('eventType', { view: document }).view");
 shouldBe("new UIEvent('eventType', { view: undefined }).view", "null");
 shouldBe("new UIEvent('eventType', { view: null }).view", "null");
-shouldBe("new UIEvent('eventType', { view: false }).view", "null");
-shouldBe("new UIEvent('eventType', { view: true }).view", "null");
-shouldBe("new UIEvent('eventType', { view: '' }).view", "null");
-shouldBe("new UIEvent('eventType', { view: 'chocolate' }).view", "null");
-shouldBe("new UIEvent('eventType', { view: 12345 }).view", "null");
-shouldBe("new UIEvent('eventType', { view: 18446744073709551615 }).view", "null");
-shouldBe("new UIEvent('eventType', { view: NaN }).view", "null");
+shouldThrow("new UIEvent('eventType', { view: false }).view");
+shouldThrow("new UIEvent('eventType', { view: true }).view");
+shouldThrow("new UIEvent('eventType', { view: '' }).view");
+shouldThrow("new UIEvent('eventType', { view: 'chocolate' }).view");
+shouldThrow("new UIEvent('eventType', { view: 12345 }).view");
+shouldThrow("new UIEvent('eventType', { view: 18446744073709551615 }).view");
+shouldThrow("new UIEvent('eventType', { view: NaN }).view");
 // Note that valueOf() is not called, when the left hand side is evaluated.
-shouldBeFalse("new UIEvent('eventType', { view: {valueOf: function () { return window; } } }).view == window");
-shouldBe("new UIEvent('eventType', { get view() { return 123; } }).view", "null");
+shouldThrow("new UIEvent('eventType', { view: {valueOf: function () { return window; } } }).view == window");
+shouldBe("new UIEvent('eventType', { get view() { return window; } }).view", "window");
+shouldThrow("new UIEvent('eventType', { get view() { return 123; } }).view");
 shouldThrow("new UIEvent('eventType', { get view() { throw 'UIEvent Error'; } })");
 
 // detail is passed.