WebApps: Remove (another) redundant call to SetLaunchPaths.

Following from https://chromium-review.googlesource.com/1984792, this CL
removes a further redundant call to WebLaunchFilesHelper::SetLaunchPaths,
this time in OpenApplicationWindow.

Bug: 1007621
Change-Id: I79732f93499b209fce42db9a758969bc8b8d8c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003159Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Robert Woods <robertwoods@google.com>
Cr-Commit-Position: refs/heads/master@{#732602}

chrome/browser/ui/extensions/application_launch.cc

@@ -461,11 +461,6 @@ WebContents* OpenApplicationWindow(Profile* profile,
   WebContents* web_contents = NavigateApplicationWindow(
       browser, params, url, WindowOpenDisposition::NEW_FOREGROUND_TAB);
 
-  if (base::FeatureList::IsEnabled(blink::features::kFileHandlingAPI)) {
-    web_launch::WebLaunchFilesHelper::SetLaunchPaths(
-        web_contents, web_contents->GetURL(), params.launch_files);
-  }
-
   browser->window()->Show();
   return web_contents;
 }