Allow content script insertion on about:-URLs.

chrome/common/extensions/chrome_extensions_client.cc

Index: chrome/common/extensions/chrome_extensions_client.cc
diff --git a/chrome/common/extensions/chrome_extensions_client.cc b/chrome/common/extensions/chrome_extensions_client.cc
index a45d4f80e438e41a1e7610779eed2aa1d00e8974..fc5c44b353842335c08e93384955ce081b1a4793 100644
--- a/chrome/common/extensions/chrome_extensions_client.cc
+++ b/chrome/common/extensions/chrome_extensions_client.cc
@@ -98,7 +98,9 @@ void ChromeExtensionsClient::FilterHostPermissions(
       messages->insert(PermissionMessage(
           PermissionMessage::kFavicon,
           l10n_util::GetStringUTF16(IDS_EXTENSION_PROMPT_WARNING_FAVICON)));
-    } else {
+    } else if (i->scheme() != content::kAboutScheme) {
+      // Don't warn about the about: scheme, because extensions cannot script

[not at google - send to devlin, 2014/04/10 21:12:49]

can we only support about:blank?

+      // these pages unless they have the permission to edit the frame's origin.

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

@jschuh is the origin of a top-level about:blank "null", because that's what I
get in devtools? Why isn't it "about"?

       new_hosts->AddPattern(*i);
     }
   }