Removing namespace declarations for deprecated and unused namespaces. (#1796)

These namespaces use to contain the original block hue constants,
but were deprecated (via comment, except for procedures) over a year
ago. With the removal of those constants, the declarations were
creating empty, unused objects.

blocks/math.js

@@ -29,7 +29,6 @@
  */
 'use strict';
 
-goog.provide('Blockly.Blocks.math');  // Deprecated
 goog.provide('Blockly.Constants.Math');
 
 goog.require('Blockly.Blocks');