Site Settings Desktop: Implement protocol handler section.

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index 86f4f72ed7d9cb010739f100c1f7790604090faa..09fa5fbd66b4e816f555c27d0c4fff3c05302f23 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -978,6 +978,9 @@
   <message name="IDS_SETTINGS_SITE_SETTINGS_COOKIES" desc="Label for the cookies site settings.">
     Cookies
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS" desc="Label for the protocol handlers (e.g. mailto) in site settings.">
+    Handlers
+  </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_LOCATION" desc="Label for the location site settings.">
     Location
   </message>
@@ -1062,6 +1065,15 @@
   <message name="IDS_SETTINGS_SITE_SETTINGS_BACKGROUND_SYNC_BLOCKED" desc="The block label for background sync in site settings.">
     Do not allow recently closed sites to finish sending and receiving data
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS_ASK" desc="The allow label for protocol handlers in site settings.">
+    Allow sites to ask to become default handlers for protocols
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS_ASK_RECOMMENDED" desc="The allow label for protocol handlers in site settings (with the 'recommended' suffix).">
+    Allow sites to ask to become default handlers for protocols (recommended)
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLERS_BLOCKED" desc="The block label for protocol handlers in site settings.">
+    Do not allow any site to handle protocols
+  </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_KEYGEN_ALLOW" desc="The allow label for keygen in site settings.">
     Allow all sites to use key generation in forms
   </message>
@@ -1149,6 +1161,15 @@
   <message name="IDS_SETTINGS_SITE_SETTINGS_THIRD_PARTY_COOKIE_SUBLABEL" desc="A sub-label below the Block 3rd-party cookie checkbox.">
     Prevent third-party websites from saving and reading cookie data.
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLER_IS_DEFAULT" desc="A label showing that a certain handler for a given protocol is the default.">
+    Default
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_HANDLER_SET_DEFAULT" desc="A label for the action of making a certain handler the default for a given protocol.">
+    Set as default
+  </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_REMOVE" desc="A label for the action of removing (deleting) a certain handler.">
+    Remove
+  </message>
 
   <!-- Sync / People Page -->
   <message name="IDS_SETTINGS_PEOPLE" desc="Name of the settings page which manages Chrome's signed-in Google profile.">