Add remote_install flag to extension sync data.

sync/protocol/extension_specifics.proto

Index: sync/protocol/extension_specifics.proto
diff --git a/sync/protocol/extension_specifics.proto b/sync/protocol/extension_specifics.proto
index 05120d323c1d728d016a577d59158c3f47d9be0f..2ea179440860fc7b8bdecce346cee620f9300bff 100644
--- a/sync/protocol/extension_specifics.proto
+++ b/sync/protocol/extension_specifics.proto
@@ -35,5 +35,8 @@ message ExtensionSpecifics {
 
   // The name of the extension. Used for bookmark apps.
   optional string name = 6;
+
+  // Whether this extension is being installed remotely.

[Nicolas Zea, 2014/05/02 20:46:06]

nit: is being -> has been. Also perhaps comment about whether this value can
ever actually change (I assume not?)

[Marijn Kruisselbrink, 2014/05/02 21:28:53]

Okay, I made the comment a bit clearer (since this value will actually change.
Once a user approves/enables a remotely installed extension, chrome will set
this field to false).

+  optional bool remote_install = 7;
 }