Remove explicit singletonness of ArcBridgeService part 2.

chrome/browser/chromeos/arc/fileapi/arc_file_system_instance_util.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/chromeos/arc/fileapi/arc_file_system_instance_util.h"
 
+#include <string>
+
 #include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_service_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 namespace arc {
 
 namespace file_system_instance_util {
 
 namespace {
 
 constexpr uint32_t kGetFileSizeVersion = 1;
 constexpr uint32_t kOpenFileToReadVersion = 1;
 
+// Returns FileSystemInstance for the given |min_version|, if found.
+// Otherwise, nullptr.
+mojom::FileSystemInstance* GetFileSystemInstance(
+    const std::string& method_name_for_logging,
+    uint32_t min_version) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  auto* arc_service_manager = arc::ArcServiceManager::Get();
+  if (!arc_service_manager) {
+    LOG(ERROR) << "Failed to get ArcServiceManager.";
+    return nullptr;
+  }
+  return arc_service_manager->arc_bridge_service()
+      ->file_system()
+      ->GetInstanceForMethod(method_name_for_logging, min_version);
+}
+
 void OnGetFileSize(const GetFileSizeCallback& callback, int64_t size) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   content::BrowserThread::PostTask(content::BrowserThread::IO, FROM_HERE,
                                    base::Bind(callback, size));
 }
 
 void GetFileSizeOnUIThread(const GURL& arc_url,
                            const GetFileSizeCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  auto* arc_bridge_service = arc::ArcBridgeService::Get();
-  if (!arc_bridge_service) {
-    LOG(ERROR) << "Failed to get ArcBridgeService.";
+  auto* file_system_instance =
+      GetFileSystemInstance("GetFileSize", kGetFileSizeVersion);
+  if (!file_system_instance) {
     OnGetFileSize(callback, -1);
     return;
   }
-  mojom::FileSystemInstance* file_system_instance =
-      arc_bridge_service->file_system()->GetInstanceForMethod(
-          "GetFileSize", kGetFileSizeVersion);
-  if (!file_system_instance) {
-    LOG(ERROR) << "Failed to get FileSystemInstance.";
-    OnGetFileSize(callback, -1);
-    return;
-  }
   file_system_instance->GetFileSize(arc_url.spec(),
                                     base::Bind(&OnGetFileSize, callback));
 }
 
 void OnOpenFileToRead(const OpenFileToReadCallback& callback,
                       mojo::ScopedHandle handle) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   content::BrowserThread::PostTask(content::BrowserThread::IO, FROM_HERE,
                                    base::Bind(callback, base::Passed(&handle)));
 }
 
 void OpenFileToReadOnUIThread(const GURL& arc_url,
                               const OpenFileToReadCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  auto* arc_bridge_service = arc::ArcBridgeService::Get();
-  if (!arc_bridge_service) {
-    LOG(ERROR) << "Failed to get ArcBridgeService.";
+  auto* file_system_instance =
+      GetFileSystemInstance("OpenFileToRead", kOpenFileToReadVersion);
+  if (!file_system_instance) {
     OnOpenFileToRead(callback, mojo::ScopedHandle());
     return;
   }
-  mojom::FileSystemInstance* file_system_instance =
-      arc_bridge_service->file_system()->GetInstanceForMethod(
-          "OpenFileToRead", kOpenFileToReadVersion);
-  if (!file_system_instance) {
-    LOG(ERROR) << "Failed to get FileSystemInstance.";
-    OnOpenFileToRead(callback, mojo::ScopedHandle());
-    return;
-  }
   file_system_instance->OpenFileToRead(arc_url.spec(),
                                        base::Bind(&OnOpenFileToRead, callback));
 }
 
 }  // namespace
 
 void GetFileSizeOnIOThread(const GURL& arc_url,
                            const GetFileSizeCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&GetFileSizeOnUIThread, arc_url, callback));
 }
 
 void OpenFileToReadOnIOThread(const GURL& arc_url,
                               const OpenFileToReadCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&OpenFileToReadOnUIThread, arc_url, callback));
 }
 
 }  // namespace file_system_instance_util
 
 }  // namespace arc