Delete isWebApkInstalled in ShortcutHelper.java to minimize JNI usage.

chrome/browser/android/shortcut_helper.cc

 // Copyright 2013 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/shortcut_helper.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
@@ skipping 243 matching lines @@
   std::string webapk_package_name = "";
   if (java_webapk_package_name.obj()) {
     webapk_package_name = base::android::ConvertJavaStringToUTF8(
         env, java_webapk_package_name);
   }
   return webapk_package_name;
 }
 
 // static
 bool ShortcutHelper::IsWebApkInstalled(const GURL& url) {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  ScopedJavaLocalRef<jstring> java_url =
-      base::android::ConvertUTF8ToJavaString(env, url.spec());
-  return Java_ShortcutHelper_isWebApkInstalled(env, java_url);
+  return !QueryWebApkPackage(url).empty();
 }
 
 GURL ShortcutHelper::GetScopeFromURL(const GURL& url) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> java_url =
       base::android::ConvertUTF8ToJavaString(env, url.spec());
   ScopedJavaLocalRef<jstring> java_scope_url =
       Java_ShortcutHelper_getScopeFromUrl(env, java_url);
   return GURL(base::android::ConvertJavaStringToUTF16(env, java_scope_url));
 }
@@ skipping 11 matching lines @@
   DCHECK(jsplash_image_callback);
   base::Closure* splash_image_callback =
       reinterpret_cast<base::Closure*>(jsplash_image_callback);
   splash_image_callback->Run();
   delete splash_image_callback;
 }
 
 bool ShortcutHelper::RegisterShortcutHelper(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }