Implement ChromeOS mime type extension mappings.

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 dca622f6e955d1ccfc522be5ccfd8fa90cee7ca7..f23426d62f95989ff470af5dfc76114fb128dc52 100644
--- a/net/base/mime_util_unittest.cc
+++ b/net/base/mime_util_unittest.cc
@@ -15,8 +15,14 @@
 namespace net {
 
 TEST(MimeUtilTest, ExtensionTest) {
+  // String: png\0css
+  base::FilePath::StringType containsNullByte;
+  containsNullByte.append(FILE_PATH_LITERAL("png"));
+  containsNullByte.append(1, FILE_PATH_LITERAL('\0'));
+  containsNullByte.append(FILE_PATH_LITERAL("css"));
+
   const struct {
-    const base::FilePath::CharType* extension;
+    const base::FilePath::StringType extension;
     const char* const mime_type;
     bool valid;
   } tests[] = {
@@ -25,10 +31,16 @@ TEST(MimeUtilTest, ExtensionTest) {
     {FILE_PATH_LITERAL("css"), "text/css", true},
     {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.
+    {FILE_PATH_LITERAL("epub"), "application/epub+zip", true},
+    {FILE_PATH_LITERAL("ics"), "text/calendar", true},
+#endif
 #if defined(OS_ANDROID)
     {FILE_PATH_LITERAL("m3u8"), "application/x-mpegurl", true},
 #endif
     {FILE_PATH_LITERAL("not an extension / for sure"), "", false},
+    {containsNullByte, "", false}
   };
 
   std::string mime_type;