Document.title getter should return text of title element and setter should stop when head el…

LayoutTests/svg/custom/multiple-title-elements.svg

Index: LayoutTests/svg/custom/multiple-title-elements.svg
diff --git a/LayoutTests/svg/custom/multiple-title-elements.svg b/LayoutTests/svg/custom/multiple-title-elements.svg
index 97b38cf11b504a19b3a174b738e6d018627e4d05..e6393045bde2d69e2d960f292879fb9a2349049b 100644
--- a/LayoutTests/svg/custom/multiple-title-elements.svg
+++ b/LayoutTests/svg/custom/multiple-title-elements.svg
@@ -40,9 +40,9 @@ function test()
 
     expect('', document.title);
     document.documentElement.appendChild(createTitleElement('First title'));
-    expect('First title', document.title);
+    expect('', document.title);

[Inactive, 2014/07/16 14:42:05]

Why this behavior change for SVG?

[kangil_, 2014/07/18 06:55:58]

Done.

     document.documentElement.appendChild(createTitleElement('Second title'));
-    expect('First title', document.title);
+    expect('', document.title);
 }
 </script>
 <g id="console">