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

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 7222da80a2736bf4d29df1f6fb652e66d5bf2ead..7be10da11631556c2131973ad5039ee8e99066e7 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1568,9 +1568,6 @@ const char kDefaultAudioCaptureDevice[] = "media.default_audio_capture_device";
 // The default video capture device used by the Media content setting.
 const char kDefaultVideoCaptureDevice[] = "media.default_video_capture_Device";
 
-// The salt used for creating random MediaSource IDs.
-const char kMediaDeviceIdSalt[] = "media.device_id_salt";
-
 // The last used printer and its settings.
 const char kPrintPreviewStickySettings[] =
     "printing.print_preview_sticky_settings";