Use IOSImageDataFetcherWrapper for favicon

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
index 4855dbf1974c0961283ca74a4280f1e078c01605..ba87ba08d8f400109c3ded47e2f8cb3f14696f65 100644
--- a/components/image_fetcher/request_metadata_unittest.cc
+++ b/components/image_fetcher/request_metadata_unittest.cc
@@ -13,6 +13,8 @@ TEST(RequestMetadataTest, Equality) {
   RequestMetadata lhs;
   rhs.mime_type = "testMimeType";
   lhs.mime_type = "testMimeType";
+  rhs.response_code = 1;
+  lhs.response_code = 1;
 
   EXPECT_EQ(rhs, lhs);
 }
@@ -21,9 +23,17 @@ TEST(RequestMetadataTest, NoEquality) {
   RequestMetadata rhs;
   RequestMetadata lhs;
   rhs.mime_type = "testMimeType";
+  lhs.mime_type = "testMimeType";
+  rhs.response_code = 1;
+  lhs.response_code = 1;
+
   lhs.mime_type = "testOtherMimeType";
+  EXPECT_NE(rhs, lhs);
+  lhs.mime_type = "testMimeType";
 
+  lhs.response_code = 2;
   EXPECT_NE(rhs, lhs);
+  lhs.response_code = 1;
 }
 
 }  // namespace image_fetcher