chore(typings): remove StringMap

This was a poorly typed attempt to mimic TypeScript's index signatures,
which we can use instead.
This eliminates a very strange type that we were exposing to users, but
not re-exporting through our public API.

Fixes #4483

modules/angular2/test/core/change_detection/change_detector_config.ts

@@ -176,7 +176,7 @@ class _ExpressionWithLocals {
    * Map from test id to _ExpressionWithLocals.
    * Tests in this map define an expression and local values which those expressions refer to.
    */
-  static availableDefinitions: StringMap<string, _ExpressionWithLocals> = {
+  static availableDefinitions: {[key: string]: _ExpressionWithLocals} = {
     'valueFromLocals': new _ExpressionWithLocals(
         'key', new Locals(null, MapWrapper.createFromPairs([['key', 'value']]))),
     'functionFromLocals': new _ExpressionWithLocals(
@@ -241,7 +241,7 @@ class _ExpressionWithMode {
    * Map from test id to _ExpressionWithMode.
    * Definitions in this map define conditions which allow testing various change detector modes.
    */
-  static availableDefinitions: StringMap<string, _ExpressionWithMode> = {
+  static availableDefinitions: {[key: string]: _ExpressionWithMode} = {
     'emptyUsingDefaultStrategy':
         new _ExpressionWithMode(ChangeDetectionStrategy.Default, false, false),
     'emptyUsingOnPushStrategy':
@@ -316,7 +316,7 @@ class _DirectiveUpdating {
    * Definitions in this map define definitions which allow testing directive updating.
    */
   static availableDefinitions:
-      StringMap<string, _DirectiveUpdating> = {
+      {[key: string]: _DirectiveUpdating} = {
         'directNoDispatcher': new _DirectiveUpdating(
             [_DirectiveUpdating.updateA('42', _DirectiveUpdating.basicRecords[0])],
             [_DirectiveUpdating.basicRecords[0]]),

modules/angular2/test/core/compiler/runtime_metadata_spec.ts

@@ -117,7 +117,7 @@ class DirectiveWithoutModuleId {
 class ComponentWithEverything implements OnChanges,
     OnInit, DoCheck, OnDestroy, AfterContentInit, AfterContentChecked, AfterViewInit,
     AfterViewChecked {
-  onChanges(changes: StringMap<string, SimpleChange>): void {}
+  onChanges(changes: {[key: string]: SimpleChange}): void {}
   onInit(): void {}
   doCheck(): void {}
   onDestroy(): void {}

modules/angular2/test/core/compiler/schema_registry_mock.ts

@@ -1,10 +1,9 @@
 import {ElementSchemaRegistry} from 'angular2/src/core/compiler/schema/element_schema_registry';
-import {StringMap} from 'angular2/src/core/facade/collection';
 import {isPresent} from 'angular2/src/core/facade/lang';
 
 export class MockSchemaRegistry implements ElementSchemaRegistry {
-  constructor(public existingProperties: StringMap<string, boolean>,
-              public attrPropMapping: StringMap<string, string>) {}
+  constructor(public existingProperties: {[key: string]: boolean},
+              public attrPropMapping: {[key: string]: string}) {}
   hasProperty(tagName: string, property: string): boolean {
     var result = this.existingProperties[property];
     return isPresent(result) ? result : true;

modules/angular2/test/core/compiler/template_compiler_spec.ts

@@ -325,10 +325,10 @@ function testableStylesModule(sourceModule: SourceModule): SourceModule {
 
 // Attention: read by eval!
 export function humanizeTemplate(template: CompiledTemplate,
-                                 humanizedTemplates: Map<number, StringMap<string, any>> = null):
-    StringMap<string, any> {
+                                 humanizedTemplates: Map<number, {[key: string]: any}> = null):
+    {[key: string]: any} {
   if (isBlank(humanizedTemplates)) {
-    humanizedTemplates = new Map<number, StringMap<string, any>>();
+    humanizedTemplates = new Map<number, {[key: string]: any}>();
   }
   var result = humanizedTemplates.get(template.id);
   if (isPresent(result)) {
@@ -369,7 +369,7 @@ function testChangeDetector(changeDetectorFactory: Function): string[] {
 
 class CommandHumanizer implements CommandVisitor {
   constructor(private result: any[],
-              private humanizedTemplates: Map<number, StringMap<string, any>>) {}
+              private humanizedTemplates: Map<number, {[key: string]: any}>) {}
   visitText(cmd: TextCmd, context: any): any {
     this.result.push(`#text(${cmd.value})`);
     return null;

modules/angular2/test/core/facade/collection_spec.ts

@@ -1,11 +1,6 @@
 import {describe, it, expect, beforeEach, ddescribe, iit, xit} from 'angular2/test_lib';
 
-import {
-  ListWrapper,
-  StringMap,
-  StringMapWrapper,
-  MapWrapper
-} from 'angular2/src/core/facade/collection';
+import {ListWrapper, StringMapWrapper, MapWrapper} from 'angular2/src/core/facade/collection';
 
 export function main() {
   describe('ListWrapper', () => {