Fix the WebGLObject arg non-nullable behaviors.

third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQuery.idl

Index: third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQuery.idl
diff --git a/third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQuery.idl b/third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQuery.idl
index f25f7c367035c59c6e9df279de4251ffb85ddbcd..02323880800fbb6950d2c44fc61521c527977230 100644
--- a/third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQuery.idl
+++ b/third_party/WebKit/Source/modules/webgl/EXTDisjointTimerQuery.idl
@@ -18,11 +18,11 @@ typedef unsigned long long GLuint64EXT;
     const GLenum GPU_DISJOINT_EXT            = 0x8FBB;
 
     WebGLTimerQueryEXT createQueryEXT();
-    void deleteQueryEXT([Default=Undefined] WebGLTimerQueryEXT? query);
-    boolean isQueryEXT([Default=Undefined] WebGLTimerQueryEXT? query);
-    void beginQueryEXT(GLenum target, [Default=Undefined] WebGLTimerQueryEXT? query);
+    void deleteQueryEXT(WebGLTimerQueryEXT? query);
+    boolean isQueryEXT(WebGLTimerQueryEXT? query);
+    void beginQueryEXT(GLenum target, WebGLTimerQueryEXT query);
     void endQueryEXT(GLenum target);
-    void queryCounterEXT([Default=Undefined] WebGLTimerQueryEXT? query, GLenum target);
+    void queryCounterEXT(WebGLTimerQueryEXT query, GLenum target);
     [CallWith=ScriptState] any getQueryEXT(GLenum target, GLenum pname);
-    [CallWith=ScriptState] any getQueryObjectEXT([Default=Undefined] WebGLTimerQueryEXT? query, GLenum pname);
+    [CallWith=ScriptState] any getQueryObjectEXT(WebGLTimerQueryEXT query, GLenum pname);
 };