Revert "refactor(compiler): add createAotCompiler factory"

This reverts commit 170525a225.

modules/@angular/compiler-cli/test/mocks.ts

@@ -28,14 +28,6 @@ export class MockContext implements NgHostContext {
     return undefined;
   }
 
-  readResource(fileName: string): Promise<string> {
-    const result = this.readFile(fileName);
-    if (result == null) {
-      return Promise.reject(new Error(`Resource not found: ${fileName}`));
-    }
-    return Promise.resolve(result);
-  }
-
   writeFile(fileName: string, data: string): void {
     const parts = fileName.split('/');
     const name = parts.pop();