Add support for Animated PNG

content/browser/loader/mime_sniffing_resource_handler_unittest.cc

Index: content/browser/loader/mime_sniffing_resource_handler_unittest.cc
diff --git a/content/browser/loader/mime_sniffing_resource_handler_unittest.cc b/content/browser/loader/mime_sniffing_resource_handler_unittest.cc
index 102b4411c7eb491db017a23534b182a4e7d4df06..cf1b131fc39b34e3c833ce5519879c633a963c50 100644
--- a/content/browser/loader/mime_sniffing_resource_handler_unittest.cc
+++ b/content/browser/loader/mime_sniffing_resource_handler_unittest.cc
@@ -641,9 +641,9 @@ TEST_F(MimeSniffingResourceHandlerTest, AcceptHeaders) {
   EXPECT_EQ("text/css,*/*;q=0.1",
             TestAcceptHeaderSetting(RESOURCE_TYPE_STYLESHEET));
   EXPECT_EQ("*/*", TestAcceptHeaderSetting(RESOURCE_TYPE_SCRIPT));
-  EXPECT_EQ("image/webp,image/*,*/*;q=0.8",
+  EXPECT_EQ("image/webp,image/apng,image/*,*/*;q=0.8",
             TestAcceptHeaderSetting(RESOURCE_TYPE_IMAGE));
-  EXPECT_EQ("image/webp,image/*,*/*;q=0.8",
+  EXPECT_EQ("image/webp,image/apng,image/*,*/*;q=0.8",
             TestAcceptHeaderSetting(RESOURCE_TYPE_FAVICON));
   EXPECT_EQ("*/*", TestAcceptHeaderSetting(RESOURCE_TYPE_FONT_RESOURCE));
   EXPECT_EQ("*/*", TestAcceptHeaderSetting(RESOURCE_TYPE_SUB_RESOURCE));