Make GetApplicationContext return a JavaRef.

ui/base/touch/touch_device_android.cc

 // Copyright (c) 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 "ui/base/touch/touch_device.h"
 
 #include "base/android/context_utils.h"
 #include "base/logging.h"
 #include "jni/TouchDevice_jni.h"
 
+using base::android::AttachCurrentThread;
+using base::android::GetApplicationContext;
+
 namespace ui {
 
 TouchScreensAvailability GetTouchScreensAvailability() {
   return TouchScreensAvailability::ENABLED;
 }
 
 int MaxTouchPoints() {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  jobject context = base::android::GetApplicationContext();
-  jint max_touch_points = Java_TouchDevice_maxTouchPoints(env, context);
-  return static_cast<int>(max_touch_points);
+  return Java_TouchDevice_maxTouchPoints(AttachCurrentThread(),
+                                         GetApplicationContext());
 }
 
 int GetAvailablePointerTypes() {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  jobject context = base::android::GetApplicationContext();
-  jint available_pointer_types =
-      Java_TouchDevice_availablePointerTypes(env, context);
-  return static_cast<int>(available_pointer_types);
+  return Java_TouchDevice_availablePointerTypes(AttachCurrentThread(),
+                                                GetApplicationContext());
 }
 
 PointerType GetPrimaryPointerType() {
   int available_pointer_types = GetAvailablePointerTypes();
   if (available_pointer_types & POINTER_TYPE_COARSE)
     return POINTER_TYPE_COARSE;
   if (available_pointer_types & POINTER_TYPE_FINE)
     return POINTER_TYPE_FINE;
   DCHECK_EQ(available_pointer_types, POINTER_TYPE_NONE);
   return POINTER_TYPE_NONE;
 }
 
 int GetAvailableHoverTypes() {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  jobject context = base::android::GetApplicationContext();
-  jint available_hover_types =
-      Java_TouchDevice_availableHoverTypes(env, context);
-  return static_cast<int>(available_hover_types);
+  return Java_TouchDevice_availableHoverTypes(AttachCurrentThread(),
+                                              GetApplicationContext());
 }
 
 HoverType GetPrimaryHoverType() {
   int available_hover_types = GetAvailableHoverTypes();
   if (available_hover_types & HOVER_TYPE_ON_DEMAND)
     return HOVER_TYPE_ON_DEMAND;
   if (available_hover_types & HOVER_TYPE_HOVER)
     return HOVER_TYPE_HOVER;
   DCHECK_EQ(available_hover_types, HOVER_TYPE_NONE);
   return HOVER_TYPE_NONE;
 }
 
 }  // namespace ui