refactor(compiler): renames

- `NgHost` to `CompilerHost`
- `AotCompilerHost.resolveFileToImport` to `AotCompilerHost.fileNameToModuleName`
- `AotCompilerHoset.resolveImportToFile` to `AotCompilerHost.moduleNameToFileName`

modules/@angular/compiler/test/output/output_emitter_util.ts

@@ -253,7 +253,7 @@ function createOperatorFn(op: o.BinaryOperator) {
 }
 
 export class SimpleJsImportGenerator implements ImportResolver {
-  resolveFileToImport(importedUrlStr: string, moduleUrlStr: string): string {
+  fileNameToModuleName(importedUrlStr: string, moduleUrlStr: string): string {
     return importedUrlStr;
   }
 }