refactor(TypeScript): Add noImplicitAny

We automatically insert explicit 'any's where needed. These need to be
addressed as in #9100.

Fixes #4924

modules/@angular/http/src/backends/xhr_backend.ts

@@ -107,7 +107,7 @@ export class XHRConnection implements Connection {
     });
   }
 
-  setDetectedContentType(req, _xhr) {
+  setDetectedContentType(req: any /** TODO #9100 */, _xhr: any /** TODO #9100 */) {
     // Skip if a custom Content-Type header is provided
     if (isPresent(req.headers) && isPresent(req.headers['Content-Type'])) {
       return;