Do not drop the final web app scope path component if it ends with a slash.

chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
index dac06697673f0c74635c5823fdecf9d1082d2981..769b9300a1828491f7a983e3c9a7f995ae95f074 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ShortcutHelper.java
@@ -587,15 +587,17 @@ public class ShortcutHelper {
     @CalledByNative
     public static String getScopeFromUrl(String url) {
         // Scope URL is generated by:
-        // - Removing last component of the URL.
+        // - Removing last component of the URL if it does not end with a slash.
         // - Clearing the URL's query and fragment.
 
         Uri uri = Uri.parse(url);
         List<String> path = uri.getPathSegments();
         int endIndex = path.size();
 
-        // If there is at least one path element, remove the last one.
-        if (endIndex > 0) {
+        // Remove the last path element if there is at least one path element, *and* the path does
+        // not end with a slash. This means that URLs to specific files have the file component
+        // removed, but URLs to directories retain the directory.
+        if (endIndex > 0 && !uri.getPath().endsWith("/")) {
             endIndex -= 1;
         }