refactor: update angular to support TypeScript 2.4

Detailed updates:
- rxjs@5.0.x
- tsickle@0.24.x
- typescript@2.4.x
- @bazel/typescript@0.10.0
- protractor@5.1.x
- selenium-webdriver@3.0.x

BREAKING CHANGE:
- the Angular compiler now requires TypeScript 2.4.x.

packages/language-service/test/test_utils.ts

@@ -147,6 +147,8 @@ export class MockTypescriptHost implements ts.LanguageServiceHost {
       return fs.existsSync(effectiveName);
   }
 
+  fileExists(fileName: string): boolean { return this.getRawFileContent(fileName) != null; }
+
   getMarkerLocations(fileName: string): {[name: string]: number}|undefined {
     let content = this.getRawFileContent(fileName);
     if (content) {

packages/language-service/test/ts_plugin_spec.ts

@@ -259,7 +259,7 @@ function expectEntries(locationMarker: string, info: ts.CompletionInfo, ...names
 function expectNoDiagnostics(diagnostics: ts.Diagnostic[]) {
   for (const diagnostic of diagnostics) {
     let message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
-    if (diagnostic.start) {
+    if (diagnostic.file && diagnostic.start) {
       let {line, character} = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
       console.error(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
     } else {