IndexedDB: Add draft/proposal links for some experimental APIs in IDLs

Source/modules/indexeddb/IDBIndex.idl

Index: Source/modules/indexeddb/IDBIndex.idl
diff --git a/Source/modules/indexeddb/IDBIndex.idl b/Source/modules/indexeddb/IDBIndex.idl
index ee56c88996c2bb3ddd87e4e390c8ed3ad109de2f..36f591af678df4e9cebdc8648d8aa98e518449e8 100644
--- a/Source/modules/indexeddb/IDBIndex.idl
+++ b/Source/modules/indexeddb/IDBIndex.idl
@@ -23,7 +23,7 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// http://www.w3.org/TR/IndexedDB/#idl-def-IDBIndex
+// https://w3c.github.io/IndexedDB/#idl-def-IDBIndex
 
 [
     Exposed=(Window,Worker),
@@ -32,18 +32,15 @@
     readonly attribute DOMString name;
     readonly attribute IDBObjectStore objectStore;
     [CallWith=ScriptState] readonly attribute any keyPath;
-    readonly attribute boolean unique;
     readonly attribute boolean multiEntry;
-
-    [CallWith=ScriptState, RaisesException] IDBRequest openCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
-    [CallWith=ScriptState, RaisesException] IDBRequest openKeyCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
+    readonly attribute boolean unique;
 
     [CallWith=ScriptState, RaisesException] IDBRequest get(any key);
-    // TODO(cmumford): Standardize or eventually remove.
+    [CallWith=ScriptState, RaisesException] IDBRequest getKey(any key);
     // TODO(cmumford): 0xFFFFFFFF is not necessary. Remove once crbug.com/335871 is fixed.
-    // getAll is non-standard, and therefore experimental. More info at:
-    // Documented at http://w3c.github.io/IndexedDB/#widl-IDBIndex-getAll-IDBRequest-any-query-unsigned-long-count
     [CallWith=ScriptState, RaisesException, RuntimeEnabled=IndexedDBExperimental] IDBRequest getAll([Default=Undefined] optional any range, optional unsigned long maxCount = 0xFFFFFFFF);
-    [CallWith=ScriptState, RaisesException] IDBRequest getKey(any key);
     [CallWith=ScriptState, RaisesException] IDBRequest count([Default=Undefined] optional any key);
+    [CallWith=ScriptState, RaisesException] IDBRequest openCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
+    [CallWith=ScriptState, RaisesException] IDBRequest openKeyCursor([Default=Undefined] optional any range, optional IDBCursorDirection direction = "next");
+
 };