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

chrome/browser/android/webapk/webapk_installer.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/webapk/webapk_installer.h"
 
 #include "base/android/build_info.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/path_utils.h"
@@ skipping 32 matching lines @@
 // The number of milliseconds to wait for the WebAPK download URL from the
 // WebAPK server.
 const int kWebApkDownloadUrlTimeoutMs = 4000;
 
 // The number of milliseconds to wait for the WebAPK download to complete.
 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.
 uint64_t ComputeBitmapHash(const SkBitmap& bitmap) {
   std::vector<unsigned char> png_bytes;
   gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &png_bytes);
   return MurmurHash64B(&png_bytes.front(), png_bytes.size(), kMurmur2HashSeed);
 }
 
 // Converts a color from the format specified in content::Manifest to a CSS
@@ skipping 207 matching lines @@
 
 void WebApkInstaller::OnSuccess() {
   finish_callback_.Run(true);
   delete this;
 }
 
 void WebApkInstaller::OnFailure() {
   finish_callback_.Run(false);
   delete this;
 }