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

components/media_device_id_salt/media_device_id_salt.h

Index: components/media_device_id_salt/media_device_id_salt.h
diff --git a/chrome/browser/media/media_device_id_salt.h b/components/media_device_id_salt/media_device_id_salt.h
similarity index 77%
rename from chrome/browser/media/media_device_id_salt.h
rename to components/media_device_id_salt/media_device_id_salt.h
index 5e1ec8fde31fe3150deceb44b95acb5d53480668..50374927fabc4d0ee80e5d34a46f531e93947d4a 100644
--- a/chrome/browser/media/media_device_id_salt.h
+++ b/components/media_device_id_salt/media_device_id_salt.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
-#define CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
+#ifndef COMPONENTS_MEDIA_DEVICE_ID_SALT_MEDIA_DEVICE_ID_SALT_H_
+#define COMPONENTS_MEDIA_DEVICE_ID_SALT_MEDIA_DEVICE_ID_SALT_H_
 
 #include <string>
 
@@ -14,6 +14,15 @@
 
 class PrefService;
 
+namespace media_device_id_salt {
+
+namespace prefs {
+
+// The salt used for creating random MediaSource IDs.
+extern const char kMediaDeviceIdSalt[];
+
+}  // namespace prefs
+
 // MediaDeviceIDSalt is responsible for creating and retrieving a salt string
 // that is used for creating MediaSource IDs that can be cached by a web
 // service. If the cache is cleared, the  MediaSourceIds are invalidated.
@@ -42,4 +51,6 @@ class MediaDeviceIDSalt : public base::RefCountedThreadSafe<MediaDeviceIDSalt> {
   DISALLOW_COPY_AND_ASSIGN(MediaDeviceIDSalt);
 };
 
-#endif  // CHROME_BROWSER_MEDIA_MEDIA_DEVICE_ID_SALT_H_
+}  // namespace media_device_id_salt
+
+#endif  // COMPONENTS_MEDIA_DEVICE_ID_SALT_MEDIA_DEVICE_ID_SALT_H_