rename to '_optionsChangeSubscription'

Author: sllethe

src/lib/list/selection-list.ts

@@ -61,7 +61,7 @@ export class MdSelectionList implements AfterContentInit, OnDestroy {
   private _tabOutSubscription: Subscription;
 
   /** Subscription to option changes from the selection-list. */
-  private _optionSubscription: Subscription;
+  private _optionsChangeSubscription: Subscription;
 
   /** Whether or not the option is selectable. */
   protected _selectable: boolean = true;
@@ -100,7 +100,7 @@ export class MdSelectionList implements AfterContentInit, OnDestroy {
     // Go ahead and subscribe all of the initial options
     this._subscribeOptions(this.options);
     // When the list changes, re-subscribe
-    this._optionSubscription =
+    this._optionsChangeSubscription =
       this.options.changes.subscribe((options: QueryList<MdListOption>) => {
         this._subscribeOptions(options);
       });
@@ -111,8 +111,8 @@ export class MdSelectionList implements AfterContentInit, OnDestroy {
       this._tabOutSubscription.unsubscribe();
     }
 
-    if (this._optionSubscription) {
-      this._optionSubscription.unsubscribe();
+    if (this._optionsChangeSubscription) {
+      this._optionsChangeSubscription.unsubscribe();
     }
   }