Remove goog.asserts.*

This pull requests replaces type check hint assertions with type casts,
library sanity check assertions with conditional console.assert statements
in debug mode, and runtime sanity checks with assertions that throw an
ol.AssertionError with an error code for lookup outside the library.

src/ol/array.js

@@ -1,7 +1,5 @@
 goog.provide('ol.array');
 
-goog.require('goog.asserts');
-
 
 /**
  * Performs a binary search on the provided sorted list and returns the index of the item if found. If it can't be found it'll return -1.
@@ -135,9 +133,6 @@ ol.array.linearFindNearest = function(arr, target, direction) {
         }
       }
     }
-    // We should never get here, but the compiler complains
-    // if it finds a path for which no number is returned.
-    goog.asserts.fail();
     return n - 1;
   }
 };
@@ -149,9 +144,9 @@ ol.array.linearFindNearest = function(arr, target, direction) {
  * @param {number} end End index.
  */
 ol.array.reverseSubArray = function(arr, begin, end) {
-  goog.asserts.assert(begin >= 0,
+  ol.DEBUG && console.assert(begin >= 0,
       'Array begin index should be equal to or greater than 0');
-  goog.asserts.assert(end < arr.length,
+  ol.DEBUG && console.assert(end < arr.length,
       'Array end index should be less than the array length');
   while (begin < end) {
     var tmp = arr[begin];