Assign "application/vnd.android.package-archive" type to APK files on ChromeOS.

net/base/mime_util_unittest.cc

Index: net/base/mime_util_unittest.cc
diff --git a/net/base/mime_util_unittest.cc b/net/base/mime_util_unittest.cc
index 0787d8cda505c2f5acb44fb86779f96a0547b987..3d9296a1a9a36ed0a496ec9198b7839acb367f62 100644
--- a/net/base/mime_util_unittest.cc
+++ b/net/base/mime_util_unittest.cc
@@ -28,8 +28,10 @@ TEST(MimeUtilTest, ExtensionTest) {
     {FILE_PATH_LITERAL("pjp"), "image/jpeg", true},
     {FILE_PATH_LITERAL("pjpeg"), "image/jpeg", true},
 #if defined(OS_CHROMEOS)
-    // These two are test cases for testing platform mime types on Chrome OS.
+    // These are test cases for testing platform mime types on Chrome OS.
     {FILE_PATH_LITERAL("epub"), "application/epub+zip", true},
+    {FILE_PATH_LITERAL("apk"), "application/vnd.android.package-archive", true},
+    {FILE_PATH_LITERAL("zip"), "application/zip", true},
     {FILE_PATH_LITERAL("ics"), "text/calendar", true},
 #endif
 #if defined(OS_ANDROID)