Desktop PWAs: Omit unneeded GetAppLaunchURL call

The result of GetAppLaunchURL() is no longer being used
in WebAppUninstallBrowserTest::UninstallWebApp().

The call is removed.

Change-Id: I39552fd7ce852fbf79a72b2559e06c8b581bae00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067772Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743848}

chrome/browser/ui/web_applications/web_app_uninstall_browsertest.cc

@@ -12,7 +12,6 @@
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/web_applications/test/web_app_browsertest_util.h"
 #include "chrome/browser/ui/web_applications/web_app_controller_browsertest.h"
-#include "chrome/browser/web_applications/components/app_registrar.h"
 #include "chrome/browser/web_applications/components/install_finalizer.h"
 #include "chrome/browser/web_applications/components/web_app_id.h"
 #include "chrome/browser/web_applications/components/web_app_provider_base.h"
@@ -32,7 +31,6 @@ class WebAppUninstallBrowserTest : public WebAppControllerBrowserTest {
   void UninstallWebApp(const AppId& app_id) {
     WebAppProviderBase* const provider =
         WebAppProviderBase::GetProviderBase(profile());
-    const GURL launch_url = provider->registrar().GetAppLaunchURL(app_id);
     base::RunLoop run_loop;
 
     DCHECK(provider->install_finalizer().CanUserUninstallExternalApp(app_id));