fix(dev-infra): update type castings for JSON.parse usage (#40710)

Update usages of JSON.parse to be cast as specific types.

PR Close #40710

packages/benchpress/src/webdriver/chrome_driver_extension.ts

@@ -86,7 +86,9 @@ export class ChromeDriverExtension extends WebDriverExtension {
         .then((entries) => {
           const events: PerfLogEvent[] = [];
           entries.forEach((entry: any) => {
-            const message = (JSON.parse(entry['message']) as {message: any})['message'];
+            const message =
+                (JSON.parse(entry['message']) as
+                 {message: {method: string, params: PerfLogEvent}})['message'];
             if (message['method'] === 'Tracing.dataCollected') {
               events.push(message['params']);
             }

packages/benchpress/src/webdriver/ios_driver_extension.ts

@@ -44,7 +44,9 @@ export class IOsDriverExtension extends WebDriverExtension {
         .then((entries) => {
           const records: any[] = [];
           entries.forEach((entry: any) => {
-            const message = (JSON.parse(entry['message']) as {message: any})['message'];
+            const message =
+                (JSON.parse(entry['message']) as
+                 {message: {method: string, params: PerfLogEvent}})['message'];
             if (message['method'] === 'Timeline.eventRecorded') {
               records.push(message['params']['record']);
             }

packages/benchpress/test/reporter/json_file_reporter_spec.ts

@@ -50,7 +50,7 @@ import {Injector, JsonFileReporter, MeasureValues, Options, SampleDescription} f
                  [mv(0, 0, {'a': 3, 'b': 6}), mv(1, 1, {'a': 5, 'b': 9})]);
          const regExp = /somePath\/someId_\d+\.json/;
          expect(loggedFile['filename'].match(regExp) != null).toBe(true);
-         const parsedContent = JSON.parse(loggedFile['content']) as any;
+         const parsedContent = JSON.parse(loggedFile['content']) as {[key: string]: any};
          expect(parsedContent).toEqual({
            'description': {
              'id': 'someId',