[lighthouse] Remove deprecated internal flags

Lighthouse issue:
https://github.com/GoogleChrome/lighthouse/issues/13980

Bug: None
Change-Id: I290d56d1cbf9d61f0ef6b10ce5a5009eddec8460
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3965275
Reviewed-by: Connor Clark <cjamcl@chromium.org>
Commit-Queue: Connor Clark <cjamcl@chromium.org>

front_end/entrypoints/lighthouse_worker/LighthouseWorkerService.ts

@@ -125,7 +125,7 @@ async function invokeLH(action: string, args: any): Promise<unknown> {
     }
 
     // @ts-expect-error https://github.com/GoogleChrome/lighthouse/issues/11628
-    const config = args.config || self.createConfig(args.categoryIDs, flags.emulatedFormFactor);
+    const config = args.config || self.createConfig(args.categoryIDs, flags.formFactor);
     const url = args.url;
 
     // Handle legacy Lighthouse runner path.

front_end/panels/lighthouse/LighthouseController.ts

@@ -346,21 +346,16 @@ export class LighthouseController extends Common.ObjectWrapper.ObjectWrapper<Eve
   }
 
   getFlags(): {
-    internalDisableDeviceScreenEmulation: boolean,
-    emulatedFormFactor: (string|undefined),
+    formFactor: (string|undefined),
     legacyNavigation: boolean,
     mode: string,
   } {
-    const flags = {
-      // DevTools handles all the emulation. This tells Lighthouse to not bother with emulation.
-      internalDisableDeviceScreenEmulation: true,
-    };
+    const flags = {};
     for (const runtimeSetting of RuntimeSettings) {
       runtimeSetting.setFlags(flags, runtimeSetting.setting.get());
     }
     return flags as {
-      internalDisableDeviceScreenEmulation: boolean,
-      emulatedFormFactor: (string | undefined),
+      formFactor: (string | undefined),
       legacyNavigation: boolean,
       mode: string,
     };
@@ -487,7 +482,7 @@ export const RuntimeSettings: RuntimeSetting[] = [
     description: i18nLazyString(UIStrings.applyMobileEmulationDuring),
     setFlags: (flags: Flags, value: string|boolean): void => {
       // See Audits.AuditsPanel._setupEmulationAndProtocolConnection()
-      flags.emulatedFormFactor = value;
+      flags.formFactor = value;
     },
     options: [
       {label: i18nLazyString(UIStrings.mobile), value: 'mobile'},

front_end/panels/lighthouse/LighthousePanel.ts

@@ -454,8 +454,6 @@ export class LighthousePanel extends UI.Panel.Panel {
    * We set the device emulation on the DevTools-side for two reasons:
    * 1. To workaround some odd device metrics emulation bugs like occuluding viewports
    * 2. To get the attractive device outline
-   *
-   * We also set flags.internalDisableDeviceScreenEmulation = true to let LH only apply UA emulation
    */
   private async setupEmulationAndProtocolConnection(): Promise<void> {
     const flags = this.controller.getFlags();
@@ -475,10 +473,10 @@ export class LighthousePanel extends UI.Panel.Panel {
     };
 
     emulationModel.toolbarControlsEnabledSetting().set(false);
-    if ('emulatedFormFactor' in flags && flags.emulatedFormFactor === 'desktop') {
+    if ('formFactor' in flags && flags.formFactor === 'desktop') {
       emulationModel.enabledSetting().set(false);
       emulationModel.emulate(EmulationModel.DeviceModeModel.Type.None, null, null);
-    } else if (flags.emulatedFormFactor === 'mobile') {
+    } else if (flags.formFactor === 'mobile') {
       emulationModel.enabledSetting().set(true);
       emulationModel.deviceOutlineSetting().set(true);