refactor(facade): Remove most of StringMapWrapper facade. (#12022)

This change mostly automated by
12012b07a2
with some manual fixes.

modules/@angular/forms/src/form_builder.ts

@@ -9,7 +9,6 @@
 import {Injectable} from '@angular/core';
 
 import {AsyncValidatorFn, ValidatorFn} from './directives/validators';
-import {StringMapWrapper} from './facade/collection';
 import {isArray, isPresent} from './facade/lang';
 import {AbstractControl, FormArray, FormControl, FormGroup} from './model';
 
@@ -75,8 +74,8 @@ export class FormBuilder {
   /** @internal */
   _reduceControls(controlsConfig: {[k: string]: any}): {[key: string]: AbstractControl} {
     var controls: {[key: string]: AbstractControl} = {};
-    StringMapWrapper.forEach(controlsConfig, (controlConfig: any, controlName: string) => {
-      controls[controlName] = this._createControl(controlConfig);
+    Object.keys(controlsConfig).forEach(controlName => {
+      controls[controlName] = this._createControl(controlsConfig[controlName]);
     });
     return controls;
   }

modules/@angular/forms/src/model.ts

@@ -939,9 +939,9 @@ export class FormGroup extends AbstractControl {
    */
   setValue(value: {[key: string]: any}, {onlySelf}: {onlySelf?: boolean} = {}): void {
     this._checkAllValuesPresent(value);
-    StringMapWrapper.forEach(value, (newValue: any, name: string) => {
+    Object.keys(value).forEach(name => {
       this._throwIfControlMissing(name);
-      this.controls[name].setValue(newValue, {onlySelf: true});
+      this.controls[name].setValue(value[name], {onlySelf: true});
     });
     this.updateValueAndValidity({onlySelf: onlySelf});
   }
@@ -968,9 +968,9 @@ export class FormGroup extends AbstractControl {
    *  ```
    */
   patchValue(value: {[key: string]: any}, {onlySelf}: {onlySelf?: boolean} = {}): void {
-    StringMapWrapper.forEach(value, (newValue: any, name: string) => {
+    Object.keys(value).forEach(name => {
       if (this.controls[name]) {
-        this.controls[name].patchValue(newValue, {onlySelf: true});
+        this.controls[name].patchValue(value[name], {onlySelf: true});
       }
     });
     this.updateValueAndValidity({onlySelf: onlySelf});
@@ -1046,7 +1046,7 @@ export class FormGroup extends AbstractControl {
 
   /** @internal */
   _forEachChild(cb: (v: any, k: string) => void): void {
-    StringMapWrapper.forEach(this.controls, cb);
+    Object.keys(this.controls).forEach(k => cb(this.controls[k], k));
   }
 
   /** @internal */

modules/@angular/forms/src/validators.ts

@@ -152,5 +152,5 @@ function _mergeErrors(arrayOfErrors: any[]): {[key: string]: any} {
       arrayOfErrors.reduce((res: {[key: string]: any}, errors: {[key: string]: any}) => {
         return isPresent(errors) ? StringMapWrapper.merge(res, errors) : res;
       }, {});
-  return StringMapWrapper.isEmpty(res) ? null : res;
+  return Object.keys(res).length === 0 ? null : res;
 }