Make WebAPK use "start URL longest path" as the scope if the scope is missing

chrome/browser/android/webapk/webapk_installer.cc

Index: chrome/browser/android/webapk/webapk_installer.cc
diff --git a/chrome/browser/android/webapk/webapk_installer.cc b/chrome/browser/android/webapk/webapk_installer.cc
index 645f84220524ed80767ec2c07154aee816358739..d07f5a5029d9298cd953a4db90c1b9ea19f36f9a 100644
--- a/chrome/browser/android/webapk/webapk_installer.cc
+++ b/chrome/browser/android/webapk/webapk_installer.cc
@@ -50,7 +50,9 @@ const int kDownloadTimeoutMs = 20000;
 // Returns the scope from |info| if it is specified. Otherwise, returns the
 // default scope.
 GURL GetScope(const ShortcutInfo& info) {
-  return (info.scope.is_valid()) ? info.scope : info.url.GetOrigin();
+  return (info.scope.is_valid())
+      ? info.scope
+      : ShortcutHelper::GetScopeFromURL(info.url);
 }
 
 // Computes a murmur2 hash of |bitmap|'s PNG encoded bytes.