Fix the WebGLObject arg non-nullable behaviors.

third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQueryWebGL2.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/webgl/EXTDisjointTimerQueryWebGL2.h"
 
 #include "bindings/modules/v8/WebGLAny.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
@@ skipping 20 matching lines @@
 const char* EXTDisjointTimerQueryWebGL2::extensionName() {
   return "EXT_disjoint_timer_query_webgl2";
 }
 
 void EXTDisjointTimerQueryWebGL2::queryCounterEXT(WebGLQuery* query,
                                                   GLenum target) {
   WebGLExtensionScopedContext scoped(this);
   if (scoped.isLost())
     return;
 
-  if (!query || query->isDeleted() ||
+  DCHECK(query);
+  if (query->isDeleted() ||
       !query->validate(scoped.context()->contextGroup(), scoped.context())) {
     scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "queryCounterEXT",
                                         "invalid query");
     return;
   }
 
   if (target != GL_TIMESTAMP_EXT) {
     scoped.context()->synthesizeGLError(GL_INVALID_ENUM, "queryCounterEXT",
                                         "invalid target");
     return;
@@ skipping 16 matching lines @@
 }
 
 EXTDisjointTimerQueryWebGL2::EXTDisjointTimerQueryWebGL2(
     WebGLRenderingContextBase* context)
     : WebGLExtension(context) {
   context->extensionsUtil()->ensureExtensionEnabled(
       "GL_EXT_disjoint_timer_query_webgl2");
 }
 
 }  // namespace blink