fix(closure): replace property accesses (angular#11078)

Accessing a property on the window object must be done with square brackets.
Otherwise closure compiler may collide the symbol's alias between the property
and variable mappings.
Also, accessing the 'provide' property must be done with dot syntax, so that
it can be renamed along with the code that declares such a property.

modules/@angular/core/src/di/reflective_provider.ts

@@ -185,7 +185,7 @@ function _normalizeProviders(providers: Provider[], res: Provider[]): Provider[]
     if (b instanceof Type) {
       res.push({provide: b, useClass: b});
 
-    } else if (b && typeof b == 'object' && b.hasOwnProperty('provide')) {
+    } else if (b && typeof b == 'object' && (b as any).provide !== undefined) {
       res.push(b as NormalizedProvider);
 
     } else if (b instanceof Array) {

modules/@angular/platform-browser/src/browser/testability.ts

@@ -68,10 +68,10 @@ export class BrowserGetTestability implements GetTestability {
       });
     };
 
-    if (!global.frameworkStabilizers) {
-      global.frameworkStabilizers = ListWrapper.createGrowableSize(0);
+    if (!global['frameworkStabilizers']) {
+      global['frameworkStabilizers'] = ListWrapper.createGrowableSize(0);
     }
-    global.frameworkStabilizers.push(whenAllStable);
+    global['frameworkStabilizers'].push(whenAllStable);
   }
 
   findTestabilityInTree(registry: TestabilityRegistry, elem: any, findInAncestors: boolean):