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

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit current_release="1" latest_public_release="0">
   <outputs>
     <output filename="values-am/android_chrome_strings.xml" lang="am" type="android" />
     <output filename="values-ar/android_chrome_strings.xml" lang="ar" type="android" />
     <output filename="values-bg/android_chrome_strings.xml" lang="bg" type="android" />
     <output filename="values-ca/android_chrome_strings.xml" lang="ca" type="android" />
     <output filename="values-cs/android_chrome_strings.xml" lang="cs" type="android" />
     <output filename="values-da/android_chrome_strings.xml" lang="da" type="android" />
     <output filename="values-de/android_chrome_strings.xml" lang="de" type="android" />
@@ skipping 487 matching lines @@
       </message>
       <message name="IDS_WEBSITE_SETTINGS_CATEGORY_BLOCK_RECOMMENDED" desc="Summary text explaining that a permission is blocked, which is the recommended setting.">
         Block (recommended)
       </message>
       <message name="IDS_WEBSITE_SETTINGS_CATEGORY_ASK_BEFORE_SENDING" desc="Summary text explaining that permission will be requested before sending things, e.g. notifications.">
         Ask before sending (recommended)
       </message>
       <message name="IDS_WEBSITE_SETTINGS_CATEGORY_ASK_BEFORE_ACCESSING" desc="Summary text explaining that permission will be requested before accessing something, like location.">
         Ask before accessing (recommended)
       </message>
       <message name="IDS_WEBSITE_SETTINGS_CATEGORY_ASK_BEFORE_ACCESSING_CAMERA_MIC" desc="Summary text explaining that permission will be requested before accessing the camera and microphone.">

[newt (away), 2015/04/22 17:35:55]

we can delete this string, right?

[Finnur, 2015/04/24 13:52:00]

Done.

         Ask before accessing camera and microphone (recommended)
       </message>
+      <message name="IDS_WEBSITE_SETTINGS_CATEGORY_ASK_BEFORE_ACCESSING_CAMERA" desc="Summary text explaining that permission will be requested before accessing the camera.">
+        Ask before accessing camera (recommended)
+      </message>
+      <message name="IDS_WEBSITE_SETTINGS_CATEGORY_ASK_BEFORE_ACCESSING_MIC" desc="Summary text explaining that permission will be requested before accessing the microphone.">
+        Ask before accessing microphone (recommended)
+      </message>
       <message name="IDS_WEBSITE_SETTINGS_CATEGORY_COOKIE_ALLOWED" desc="Summary text explaining that sites are allowed to use cookies and that it is the recommended setting.">
         Allow sites to save and read cookie data (recommended)
       </message>
       <message name="IDS_WEBSITE_SETTINGS_PERMISSIONS_ALLOW" desc="Summary text explaining that the user will allow a website to access some permission, e.g. JavaScript: allow.">
         Allow
       </message>
       <message name="IDS_WEBSITE_SETTINGS_PERMISSIONS_BLOCK" desc="Summary text explaining that the user will block a website from accessing some permission, e.g. JavaScript: block.">
         Block
       </message>
       <message name="IDS_WEBSITE_SETTINGS_SEARCH" desc="The label for the search button on the Website Settings page.">
@@ skipping 31 matching lines @@
         Location
       </message>
       <message name="IDS_GEOLOCATION_PERMISSION_TITLE" desc="Title for the permission of accessing the current location of a device [CHAR-LIMIT=32]">
         Location access
       </message>
       <message name="IDS_ANDROID_LOCATION_OFF" desc="Text at the top of the Website list, explaining to the user that the location service in Android is turned off. Contains a link to the settings menu to change it.">
         Turn on location in <ph name="BEGIN_LINK">&lt;link&gt;</ph>Android Settings<ph name="END_LINK">&lt;/link&gt;</ph>.
       </message>
 
       <!-- Camera and microphone preferences -->
       <message name="IDS_WEBSITE_SETTINGS_USE_CAMERA_OR_MIC" desc="The category filter 'Camera/Mic' for content settings.">

[newt (away), 2015/04/22 17:35:55]

delete this?

[Finnur, 2015/04/24 13:52:00]

Done.

         Camera or microphone
       </message>
-      <message name="IDS_VIDEO_PERMISSION_TITLE" desc="Title text to be shown when the user has allowed/denied video access for the website [CHAR-LIMIT=32]">
+      <message name="IDS_WEBSITE_SETTINGS_USE_CAMERA" desc="The category filter 'Camera' for content settings.">
+        Camera
+      </message>
+      <message name="IDS_WEBSITE_SETTINGS_USE_MIC" desc="The category filter 'Mic' for content settings.">
+        Microphone
+      </message>
+      <message name="IDS_CAMERA_PERMISSION_TITLE" desc="Title text to be shown when the user has allowed/denied video access for the website [CHAR-LIMIT=32]">
         Access your camera
       </message>
-      <message name="IDS_VOICE_PERMISSION_TITLE" desc="Title text to be shown when the user has allowed/denied voice access for the website [CHAR-LIMIT=32]">
+      <message name="IDS_MIC_PERMISSION_TITLE" desc="Title text to be shown when the user has allowed/denied voice access for the website [CHAR-LIMIT=32]">
         Access your microphone
       </message>
       <message name="IDS_VOICE_AND_VIDEO_PERMISSION_TITLE" desc="Title text to be shown when the user has allowed/denied voice and video access for the website [CHAR-LIMIT=32]">
         Access your mic and camera
       </message>
 
       <!-- Protected content preferences -->
       <message name="IDS_PROTECTED_CONTENT" desc="Title for link to protected content settings [CHAR-LIMIT=32]">
         Protected content
       </message>
@@ skipping 960 matching lines @@
       <message name="IDS_ACCESSIBILITY_PAUSE" desc="Content description for the pause button that pauses playing the media.">
         Pause
       </message>
       <message name="IDS_ACCESSIBILITY_STOP" desc="Content description for the stop button that stops playing the media.">
         Stop
       </message>
 
     </messages>
   </release>
 </grit>