Content settings clean-up: Clarify resource identifier & get rid of NO_RESOURCE_IDENTIFIER.

chrome/browser/media/media_stream_devices_controller.cc

Index: chrome/browser/media/media_stream_devices_controller.cc
diff --git a/chrome/browser/media/media_stream_devices_controller.cc b/chrome/browser/media/media_stream_devices_controller.cc
index fb6f3816ab5ad6b3787be44e26ea15e40f1f11d7..6afb2b9f0e786fa003d0a5d92ff1905c8382fd7b 100644
--- a/chrome/browser/media/media_stream_devices_controller.cc
+++ b/chrome/browser/media/media_stream_devices_controller.cc
@@ -543,9 +543,11 @@ bool MediaStreamDevicesController::IsRequestAllowedByDefault() const {
         return false;
       }
       if (profile_->GetHostContentSettingsMap()->GetContentSetting(
-              request_.security_origin, request_.security_origin,
-              device_checks[i].settings_type, NO_RESOURCE_IDENTIFIER) !=
-              CONTENT_SETTING_ALLOW) {
+              request_.security_origin,
+              request_.security_origin,
+              device_checks[i].settings_type,
+              content_settings::ResourceIdentifier()) !=
+          CONTENT_SETTING_ALLOW) {
         return false;
       }
     }
@@ -561,10 +563,11 @@ int MediaStreamDevicesController::FilterBlockedByDefaultDevices() {
 
   if (IsDeviceAudioCaptureRequestedAndAllowed()) {
     if (profile_->GetHostContentSettingsMap()->GetContentSetting(
-        request_.security_origin,
-        request_.security_origin,
-        CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC,
-        NO_RESOURCE_IDENTIFIER) == CONTENT_SETTING_BLOCK) {
+            request_.security_origin,
+            request_.security_origin,
+            CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC,
+            content_settings::ResourceIdentifier()) ==
+        CONTENT_SETTING_BLOCK) {
       request_permissions_[content::MEDIA_DEVICE_AUDIO_CAPTURE].permission =
           MEDIA_BLOCKED_BY_USER_SETTING;
     } else {
@@ -574,10 +577,11 @@ int MediaStreamDevicesController::FilterBlockedByDefaultDevices() {
 
   if (IsDeviceVideoCaptureRequestedAndAllowed()) {
     if (profile_->GetHostContentSettingsMap()->GetContentSetting(
-        request_.security_origin,
-        request_.security_origin,
-        CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA,
-        NO_RESOURCE_IDENTIFIER) == CONTENT_SETTING_BLOCK) {
+            request_.security_origin,
+            request_.security_origin,
+            CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA,
+            content_settings::ResourceIdentifier()) ==
+        CONTENT_SETTING_BLOCK) {
       request_permissions_[content::MEDIA_DEVICE_VIDEO_CAPTURE].permission =
           MEDIA_BLOCKED_BY_USER_SETTING;
     } else {