*DRAFT* Move MediaDeviceIDSalt from chrome/ to components/ and use it in Android WebView.

components/media_device_id_salt/BUILD.gn

Index: components/media_device_id_salt/BUILD.gn
diff --git a/components/browsing_data_ui/BUILD.gn b/components/media_device_id_salt/BUILD.gn
similarity index 52%
copy from components/browsing_data_ui/BUILD.gn
copy to components/media_device_id_salt/BUILD.gn
index 3faf508eb15deef98ab977d69f5e1fe77e08a4cf..a03078fb2586ad006c8a4cb1f8dc93947adc3db0 100644
--- a/components/browsing_data_ui/BUILD.gn
+++ b/components/media_device_id_salt/BUILD.gn
@@ -2,15 +2,16 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-static_library("browsing_data_ui") {
+source_set("media_device_id_salt") {
   sources = [
-    "history_notice_utils.cc",
-    "history_notice_utils.h",
+    "media_device_id_salt.cc",
+    "media_device_id_salt.h",
   ]
 
   deps = [
     "//base",
-    "//components/browser_sync/browser",
-    "//components/history/core/browser",
+    "//components/pref_registry",
+    "//components/prefs",
+    "//content/public/browser",
   ]
 }