bindings: Moves custom getters/setters to the prototype chain.

LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt

Index: LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
diff --git a/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt b/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
index 24749b2076e55573e4f82412026edfcb33c3a0c7..76c9289cbd32dfab81bfee07fa1afbd09db9660c 100644
--- a/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
+++ b/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt
@@ -516,6 +516,7 @@ interface CryptoKey
     getter usages
     method constructor
 interface CustomEvent
+    getter detail
     method constructor
     method initCustomEvent
 interface DOMError
@@ -1097,6 +1098,7 @@ interface Error
     method toString
 interface ErrorEvent
     getter colno
+    getter error
     getter filename
     getter lineno
     getter message
@@ -2191,11 +2193,13 @@ interface HTMLOptionElement
     setter text
     setter value
 interface HTMLOptionsCollection
+    getter length
     getter selectedIndex
     method add
     method constructor
     method namedItem
     method remove
+    setter length
     setter selectedIndex
 interface HTMLOutputElement
     getter defaultValue
@@ -2938,6 +2942,7 @@ interface MessageChannel
     getter port2
     method constructor
 interface MessageEvent
+    getter data
     getter lastEventId
     getter origin
     getter ports
@@ -3319,6 +3324,7 @@ interface PluginArray
     method namedItem
     method refresh
 interface PopStateEvent
+    getter state
     method constructor
 interface ProcessingInstruction
     getter sheet
@@ -5889,6 +5895,8 @@ interface XMLHttpRequest
     attribute UNSENT
     getter onreadystatechange
     getter readyState
+    getter response
+    getter responseText
     getter responseType
     getter responseURL
     getter responseXML