Extracted media mime type checks from net/base/ into media/base/

media/base/BUILD.gn

Index: media/base/BUILD.gn
diff --git a/media/base/BUILD.gn b/media/base/BUILD.gn
index b93ed7092ffbe0f7191878f7f5b637852fb42c1b..df03709fb2905cd21a2f5e5b1c708b750383e6a8 100644
--- a/media/base/BUILD.gn
+++ b/media/base/BUILD.gn
@@ -9,7 +9,10 @@ import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
 
 source_set("base") {
-  visibility = [ "//media/*" ]
+  visibility = [
+    "//media/*",
+    "//mojo/*",
+  ]
   sources = [
     "audio_block_fifo.cc",
     "audio_block_fifo.h",
@@ -117,6 +120,8 @@ source_set("base") {
     "media_permission.h",
     "media_switches.cc",
     "media_switches.h",
+    "mime_util.cc",
+    "mime_util.h",
     "multi_channel_resampler.cc",
     "multi_channel_resampler.h",
     "pipeline.cc",
@@ -335,6 +340,7 @@ source_set("unittests") {
     "djb2_unittest.cc",
     "gmock_callback_support_unittest.cc",
     "key_systems_unittest.cc",
+    "mime_util_unittest.cc",
     "multi_channel_resampler_unittest.cc",
     "pipeline_unittest.cc",
     "ranges_unittest.cc",