Remove meaningless uses of [TypeChecking=Nullable]

Source/core/html/canvas/ANGLEInstancedArrays.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     DoNotCheckConstants,
     NoInterfaceObject,
-    TypeChecking=Interface|Nullable,
+    TypeChecking=Interface,
 ] interface ANGLEInstancedArrays {
     const unsigned long VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE = 0x88FE;
 
     void drawArraysInstancedANGLE(unsigned long mode, long first, long count, long primcount);
     void drawElementsInstancedANGLE(unsigned long mode, long count, unsigned long type, long long offset, long primcount);
     void vertexAttribDivisorANGLE(unsigned long index, long divisor);
 };