arc: Use the MIME type returned by the container to handle content URLs

chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.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 <string.h>
 
 #include <memory>
 #include <string>
 
 #include "base/location.h"
@@ skipping 13 matching lines @@
 #include "url/gurl.h"
 
 using File = arc::FakeFileSystemInstance::File;
 
 namespace arc {
 
 namespace {
 
 constexpr char kArcUrl[] = "content://org.chromium.foo/bar";
 constexpr char kData[] = "abcdef";
+constexpr char kMimeType[] = "application/octet-stream";
 
 class ArcContentFileSystemAsyncFileUtilTest : public testing::Test {
  public:
   ArcContentFileSystemAsyncFileUtilTest() = default;
   ~ArcContentFileSystemAsyncFileUtilTest() override = default;
 
   void SetUp() override {
-    fake_file_system_.AddFile(File(kArcUrl, kData, File::Seekable::NO));
+    fake_file_system_.AddFile(
+        File(kArcUrl, kData, kMimeType, File::Seekable::NO));
 
     arc_service_manager_ = base::MakeUnique<ArcServiceManager>(nullptr);
     arc_service_manager_->AddService(
         ArcFileSystemOperationRunner::CreateForTesting(
             arc_service_manager_->arc_bridge_service()));
     arc_service_manager_->arc_bridge_service()->file_system()->SetInstance(
         &fake_file_system_);
   }
 
  protected:
@@ skipping 33 matching lines @@
              const base::File::Info& info) {
             EXPECT_EQ(base::File::FILE_OK, error);
             EXPECT_EQ(static_cast<int64_t>(strlen(kData)), info.size);
             run_loop->Quit();
           },
           &run_loop));
   run_loop.Run();
 }
 
 }  // namespace arc