[DPWA] Fix shortcut deletion result on Windows

Shortcut deletion result should be false when the shortcut file isn't
deleted. Currently the condition is the opposite, which indicates the
file is deleted.

Bug: 1108109
Change-Id: Id002221b24f50d4b8e3ed931ad71fe9001a0635a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427425Reviewed-by: Phillis Tang <phillis@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Mandy Chen <mandy.chen@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#811731}

chrome/browser/web_applications/components/web_app_shortcut_win.cc

@@ -278,7 +278,7 @@ bool GetShortcutLocationsAndDeleteShortcuts(
       // Any shortcut could have been pinned, either by chrome or the user, so
       // they are all unpinned.
       base::win::UnpinShortcutFromTaskbar(*j);
-      if (base::DeleteFile(*j))
+      if (!base::DeleteFile(*j))
         result = false;
     }
   }