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

android_webview/browser/aw_browser_context.cc

Index: android_webview/browser/aw_browser_context.cc
diff --git a/android_webview/browser/aw_browser_context.cc b/android_webview/browser/aw_browser_context.cc
index a66d83761a8ff890e51dadccbd14f18e7404bf3f..45f68e09419f33fdac2892ebb45aee3e9d81f066 100644
--- a/android_webview/browser/aw_browser_context.cc
+++ b/android_webview/browser/aw_browser_context.cc
@@ -26,6 +26,7 @@
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/data_reduction_proxy/core/browser/data_store.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
+#include "components/media_device_id_salt/media_device_id_salt.h"
 #include "components/metrics/metrics_service.h"
 #include "components/policy/core/browser/browser_policy_connector_base.h"
 #include "components/policy/core/browser/configuration_policy_pref_store.h"
@@ -319,6 +320,7 @@ void AwBrowserContext::InitUserPrefService() {
   pref_registry->RegisterStringPref(prefs::kAuthAndroidNegotiateAccountType,
                                     std::string());
 
+  media_device_id_salt::MediaDeviceIDSalt::RegisterProfilePrefs(pref_registry);
   metrics::MetricsService::RegisterPrefs(pref_registry);
 
   PrefServiceFactory pref_service_factory;
@@ -353,7 +355,8 @@ bool AwBrowserContext::IsOffTheRecord() const {
 content::ResourceContext* AwBrowserContext::GetResourceContext() {
   if (!resource_context_) {
     resource_context_.reset(
-        new AwResourceContext(url_request_context_getter_.get()));
+        new AwResourceContext(url_request_context_getter_.get(),
+                              user_pref_service_.get(), IsOffTheRecord()));
   }
   return resource_context_.get();
 }