rename 'FileMap.delete' to 'FileMap.remove'

src/compiler/core.ts

@@ -21,7 +21,7 @@ module ts {
             get,
             set,
             contains,
-            delete: deleteItem,
+            remove,
             forEachValue: forEachValueInMap
         }
 
@@ -37,7 +37,7 @@ module ts {
             return hasProperty(files, normalizeKey(fileName));
         }
 
-        function deleteItem (fileName: string) {
+        function remove (fileName: string) {
             let key = normalizeKey(fileName);
             delete files[key];
         }

src/compiler/types.ts

@@ -7,7 +7,7 @@ module ts {
         get(fileName: string): T;
         set(fileName: string, value: T): void;
         contains(fileName: string): boolean;
-        delete(fileName: string): void;
+        remove(fileName: string): void;
         forEachValue(f: (v: T) => void): void;
     }