Use mime type for image extension

components/image_fetcher/request_metadata_unittest.cc

Index: components/image_fetcher/request_metadata_unittest.cc
diff --git a/components/image_fetcher/request_metadata_unittest.cc b/components/image_fetcher/request_metadata_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4855dbf1974c0961283ca74a4280f1e078c01605
--- /dev/null
+++ b/components/image_fetcher/request_metadata_unittest.cc
@@ -0,0 +1,29 @@
+// Copyright 2017 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 "components/image_fetcher/request_metadata.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace image_fetcher {
+
+TEST(RequestMetadataTest, Equality) {
+  RequestMetadata rhs;
+  RequestMetadata lhs;
+  rhs.mime_type = "testMimeType";
+  lhs.mime_type = "testMimeType";
+
+  EXPECT_EQ(rhs, lhs);
+}
+
+TEST(RequestMetadataTest, NoEquality) {
+  RequestMetadata rhs;
+  RequestMetadata lhs;
+  rhs.mime_type = "testMimeType";
+  lhs.mime_type = "testOtherMimeType";
+
+  EXPECT_NE(rhs, lhs);
+}
+
+}  // namespace image_fetcher