Remove deprecated goog.getLocale.

RELNOTES: Remove deprecated goog.getLocale function. goog.LOCALE should be set as a Closure Define instead.
PiperOrigin-RevId: 505775605
Change-Id: Ie34f0d2d0c9c3a2a559d3b68ae082137a96a3666

closure/goog/base.js

@@ -256,22 +256,6 @@ goog.DEBUG = goog.define('goog.DEBUG', true);
 goog.LOCALE = goog.define('goog.LOCALE', 'en');  // default to en
 
 
-/**
- * Same as `goog.LOCALE`, which should be used instead.
- *
- * Using this method just makes it harder for closure-compiler to optimize
- * your locale-specific code, since it has to take the extra step of inlining
- * this function to discover and remove code that is not used for the target
- * locale.
- *
- * @return {string}
- * @deprecated use `goog.LOCALE`
- */
-goog.getLocale = function() {
-  return goog.LOCALE;
-};
-
-
 /**
  * @define {boolean} Whether this code is running on trusted sites.
  *