Command buffer should not report depth_texture on pure ES3 without depth_texture extension.

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

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 37 matching lines @@
 }
 
 bool WebGLDepthTexture::supported(WebGLRenderingContextBase* context)
 {
     Extensions3DUtil* extensionsUtil = context->extensionsUtil();
     // Emulating the UNSIGNED_INT_24_8_WEBGL texture internal format in terms
     // of two separate texture objects is too difficult, so disable depth
     // textures unless a packed depth/stencil format is available.
     if (!extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"))
         return false;
-    return extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
-        || extensionsUtil->supportsExtension("GL_OES_depth_texture")
-        || extensionsUtil->supportsExtension("GL_ARB_depth_texture");
+    return extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture");
 }
 
 const char* WebGLDepthTexture::extensionName()
 {
     return "WEBGL_depth_texture";
 }
 
 } // namespace blink