Allow content script insertion on about:-URLs.

chrome/common/extensions/manifest_handlers/content_scripts_handler.cc

Index: chrome/common/extensions/manifest_handlers/content_scripts_handler.cc
diff --git a/chrome/common/extensions/manifest_handlers/content_scripts_handler.cc b/chrome/common/extensions/manifest_handlers/content_scripts_handler.cc
index 2753614d523e78fa55ff29da77a7d02dba4a6e56..3d24cf33dcd338ed81e75a28a5656ec3f2419a1e 100644
--- a/chrome/common/extensions/manifest_handlers/content_scripts_handler.cc
+++ b/chrome/common/extensions/manifest_handlers/content_scripts_handler.cc
@@ -110,6 +110,19 @@ bool LoadUserScriptFromDictionary(const base::DictionaryValue* content_script,
     result->set_match_all_frames(all_frames);
   }
 
+  // match about blank
+  if (content_script->HasKey(keys::kMatchesAboutBlank)) {
+    bool match_about_blank = false;
+    if (!content_script->GetBoolean(keys::kMatchesAboutBlank,
+                                    &match_about_blank)) {
+      *error = ErrorUtils::FormatErrorMessageUTF16(
+          errors::kInvalidMatchesAboutBlank,
+          base::IntToString(definition_index));
+      return false;
+    }
+    result->set_match_about_blank(match_about_blank);
+  }
+
   // matches (required)
   const base::ListValue* matches = NULL;
   if (!content_script->GetList(keys::kMatches, &matches)) {