Move the IsSupported* mime functions out of //net and into //components/mime_util

components/mime_util/BUILD.gn

Index: components/mime_util/BUILD.gn
diff --git a/components/device_event_log/BUILD.gn b/components/mime_util/BUILD.gn
similarity index 60%
copy from components/device_event_log/BUILD.gn
copy to components/mime_util/BUILD.gn
index 0b1103b2f1e4da51721820f61287ce17a7acd4e3..096db1acbfaf494fcb8426c3a74e68a4ad6d575b 100644
--- a/components/device_event_log/BUILD.gn
+++ b/components/mime_util/BUILD.gn
@@ -2,12 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("device_event_log") {
+static_library("mime_util") {
   sources = [
-    "device_event_log.cc",
-    "device_event_log.h",
-    "device_event_log_impl.cc",
-    "device_event_log_impl.h",
+    "mime_util.cc",
+    "mime_util.h",
   ]
 
   deps = [
@@ -19,11 +17,12 @@ source_set("device_event_log") {
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "device_event_log_impl_unittest.cc",
+    "mime_util_unittest.cc",
   ]
 
   deps = [
-    ":device_event_log",
+    ":mime_util",
+    "//base",
     "//testing/gtest",
   ]
 }