chore(imports): don't import ExceptionHandler from facade (#10620)

This lets us skip src/facade/exception* when compiling modules other than core.
It prevents having many conflicting declarations

modules/@angular/common/src/location/path_location_strategy.ts

@@ -6,9 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Inject, Injectable, Optional} from '@angular/core';
+import {BaseException, Inject, Injectable, Optional} from '@angular/core';
 
-import {BaseException} from '../facade/exceptions';
 import {isBlank} from '../facade/lang';
 
 import {Location} from './location';