Simplify ol.proj.addCoordinateTransforms

Equivalent projections do not need to be handled here, and the forward
and inverse functions can be function arguments instead of being nested
in an object literal.

externs/olx.js

@@ -274,33 +274,6 @@ olx.OverlayOptions.prototype.stopEvent;
 olx.OverlayOptions.prototype.insertFirst;
 
 
-/**
- * Object literal with forward and inverse coordinate transforms.
- * @typedef {{forward: function(ol.Coordinate): ol.Coordinate,
- *     inverse: function(ol.Coordinate): ol.Coordinate}}
- * @api
- */
-olx.CoordinateTransforms;
-
-
-/**
- * The forward transform function (that is, from the source projection to the
- * target projection) that takes a {@link ol.Coordinate} as argument
- * and returns the transformed {@link ol.Coordinate}.
- * @type {function(ol.Coordinate): ol.Coordinate}
- */
-olx.CoordinateTransforms.prototype.forward;
-
-
-/**
- * The inverse transform function (that is, from the target projection to the
- * source projection) that takes a {@link ol.Coordinate} as argument
- * and returns the transformed {@link ol.Coordinate}.
- * @type {function(ol.Coordinate): ol.Coordinate}
- */
-olx.CoordinateTransforms.prototype.inverse;
-
-
 /**
  * Object literal with config options for the projection.
  * @typedef {{code: string,

externs/proj4js.js

@@ -5,9 +5,12 @@
 
 
 /**
- * @type {Function}
+ * @param {...*} var_args
+ * @return {undefined|Array.<number>|Object.<{
+ *     forward: function(Array.<number>): Array.<number>,
+ *     inverse: function(Array.<number>): Array.<number>}>}
  */
-var proj4 = function() {};
+var proj4 = function(var_args) {};
 
 
 /**