Allow content script insertion on about:-URLs.

chrome/renderer/extensions/user_script_slave.cc

Index: chrome/renderer/extensions/user_script_slave.cc
diff --git a/chrome/renderer/extensions/user_script_slave.cc b/chrome/renderer/extensions/user_script_slave.cc
index bdaff10bb86692bbe69c3f3e69cadc438f90067c..0a1f2ebe57b660a52deb9d08ef6e992d641b2d40 100644
--- a/chrome/renderer/extensions/user_script_slave.cc
+++ b/chrome/renderer/extensions/user_script_slave.cc
@@ -224,6 +224,17 @@ void UserScriptSlave::InjectScripts(WebFrame* frame,
     if (!extension)
       continue;
 
+    if (data_source_url.SchemeIs(content::kAboutScheme)) {
+      if (!script->MatchesURL(data_source_url))
+        continue;
+
+      // about:-documents can access their creator's document, so (dis)allow
+      // access to the frame based on the creator's URL.
+      GURL document_origin_url(frame->document().securityOrigin().toString());
+      if (document_origin_url.is_valid())
+        data_source_url = document_origin_url;

[not at google - send to devlin, 2014/04/18 16:04:55]

pull this logic out into a helper function and use that from
user_script_scheduler.cc.

+    }
+
     // Content scripts are not tab-specific.
     const int kNoTabId = -1;
     // We don't have a process id in this context.