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 0cc90f6096dbe970c18ef8d960ee8fc48db27c57..9e130266ab1fb828bae0b9548f325dc539d4b1be 100644
--- a/content/browser/loader/mime_sniffing_resource_handler_unittest.cc
+++ b/content/browser/loader/mime_sniffing_resource_handler_unittest.cc
@@ -595,18 +595,18 @@ void MimeSniffingResourceHandlerTest::TestHandlerNoSniffing(
 TEST_F(MimeSniffingResourceHandlerTest, AcceptHeaders) {
   EXPECT_EQ(
       "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,"
-      "*/*;q=0.8",
+      "image/apng,*/*;q=0.8",
       TestAcceptHeaderSetting(RESOURCE_TYPE_MAIN_FRAME));
   EXPECT_EQ(
       "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,"
-      "*/*;q=0.8",
+      "image/apng,*/*;q=0.8",
       TestAcceptHeaderSetting(RESOURCE_TYPE_SUB_FRAME));
   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));