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Launch service will be integrated to AppService, and removed, so this CL
is used to migrate ExtensionAppLaunchManager::LaunchApplication to
extensions application_launch.

Based on the design go/integrating-launch-service-to-app-service, add
BrowserAppLauncher class to AppService to handle the launch requests,
and forward to extensions application_launch or WebAppLaunchManager.

LaunchService->LaunchApplication is replaced with AppServiceProxy's
new interface LaunchAppWithCallback.

Follow up:
1. Get command line from the current process in
GetLaunchFilesFromCommandLine:
https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/apps/app_service/launch_utils.cc;l=87
Remove command_line from interfaces parameters, and remove
command_line from AppLaunchParams:
https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/apps/app_service/app_launch_params.h;l=57

2. Move ExtensionAppLaunchManager's OpenApplication function to
AppService BrowserAppLauncher and remove ExtensionAppLaunchManager.

3. Modify web_app::WebAppLaunchManager to remove the dependency on
LaunchManager.

4. Remove LaunchManager.

Note: We can't name AppService's BrowserAppLauncher to LaunchService
based on design now, because launch_service/launch_service hasn't been
removed yet, and they are both in apps namespace, so rename it to
BrowserAppLauncher.

BUG=1061843

Change-Id: If5a36a9fe6b8ea265ed198d52fdddab477fe58a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119344Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753830}