feat(core/linker): add SimpleChanges type to lifecycle_hooks to simplify OnChanges signature

Closes #8557

modules/@angular/common/src/forms/directives/ng_control_name.ts

@@ -1,7 +1,7 @@
 import {
   OnChanges,
   OnDestroy,
-  SimpleChange,
+  SimpleChanges,
   Directive,
   forwardRef,
   Host,
@@ -114,7 +114,7 @@ export class NgControlName extends NgControl implements OnChanges,
     this.valueAccessor = selectValueAccessor(this, valueAccessors);
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     if (!this._added) {
       this.formDirective.addControl(this);
       this._added = true;

modules/@angular/common/src/forms/directives/ng_form_control.ts

@@ -1,6 +1,6 @@
 import {
   OnChanges,
-  SimpleChange,
+  SimpleChanges,
   Directive,
   forwardRef,
   Inject,
@@ -100,7 +100,7 @@ export class NgFormControl extends NgControl implements OnChanges {
     this.valueAccessor = selectValueAccessor(this, valueAccessors);
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}): void {
+  ngOnChanges(changes: SimpleChanges): void {
     if (this._isControlChanged(changes)) {
       setUpControl(this.form, this);
       this.form.updateValueAndValidity({emitEvent: false});

modules/@angular/common/src/forms/directives/ng_form_model.ts

@@ -1,5 +1,5 @@
 import {
-  SimpleChange,
+  SimpleChanges,
   OnChanges,
   Directive,
   forwardRef,
@@ -116,7 +116,7 @@ export class NgFormModel extends ControlContainer implements Form,
     super();
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}): void {
+  ngOnChanges(changes: SimpleChanges): void {
     this._checkFormPresent();
     if (StringMapWrapper.contains(changes, "form")) {
       var sync = composeValidators(this._validators);

modules/@angular/common/src/forms/directives/ng_model.ts

@@ -1,6 +1,6 @@
 import {
   OnChanges,
-  SimpleChange,
+  SimpleChanges,
   Directive,
   forwardRef,
   Inject,
@@ -72,7 +72,7 @@ export class NgModel extends NgControl implements OnChanges {
     this.valueAccessor = selectValueAccessor(this, valueAccessors);
   }
 
-  ngOnChanges(changes: {[key: string]: SimpleChange}) {
+  ngOnChanges(changes: SimpleChanges) {
     if (!this._added) {
       setUpControl(this._control, this);
       this._control.updateValueAndValidity({emitEvent: false});