Split Camera and Mic into two permissions on the Site Details page (under Site Settings).

chrome/android/java/res/xml/content_preferences.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
     <!-- All sites -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="website_settings"
         android:title="@string/all_sites"
         android:icon="@drawable/settings_all_sites" />
     <!-- Cookies -->
     <Preference
         android:key="cookies"
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences" />
     <!-- Location -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="device_location" />
-    <!-- Media -->
+    <!-- Camera -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
-        android:key="use_camera_or_mic" />
+        android:key="camera" />
+    <!-- Microphone -->
+    <Preference
+        android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
+        android:key="microphone" />
     <!-- Notifications -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="push_notifications" />
     <!-- Images -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="images" />
     <!-- JavaScript -->
     <Preference
@@ skipping 18 matching lines @@
         android:title="@string/google_translate"
         android:icon="@drawable/settings_translate" />
     <!-- Storage -->
     <!-- TODO(finnur): Move this over to the new Usage screen, once it exists. -->
     <Preference
         android:fragment="org.chromium.chrome.browser.preferences.website.WebsitePreferences"
         android:key="use_storage"
         android:title="@string/website_settings_storage"
         android:icon="@drawable/settings_storage" />
 </PreferenceScreen>