Make Blacklist::IsBlacklist asynchronous (it will need to be for safe

chrome/common/extensions/extension_set.cc

Index: chrome/common/extensions/extension_set.cc
diff --git a/chrome/common/extensions/extension_set.cc b/chrome/common/extensions/extension_set.cc
index 26ac47c07b783a8f43cffe82c52d9d5900f7109e..01f35fd652bf52838c3aa3f2d6e40b879b2e9eda 100644
--- a/chrome/common/extensions/extension_set.cc
+++ b/chrome/common/extensions/extension_set.cc
@@ -63,8 +63,8 @@ bool ExtensionSet::InsertAll(const ExtensionSet& extensions) {
   return size() != before;
 }
 
-void ExtensionSet::Remove(const std::string& id) {
-  extensions_.erase(id);
+bool ExtensionSet::Remove(const std::string& id) {
+  return extensions_.erase(id) > 0;
 }
 
 void ExtensionSet::Clear() {
@@ -137,6 +137,15 @@ const Extension* ExtensionSet::GetByID(const std::string& id) const {
     return NULL;
 }
 
+std::set<std::string> ExtensionSet::GetIDs() const {
+  std::set<std::string> ids;
+  for (ExtensionMap::const_iterator it = extensions_.begin();
+       it != extensions_.end(); ++it) {
+    ids.insert(it->first);
+  }
+  return ids;
+}
+
 bool ExtensionSet::ExtensionBindingsAllowed(
     const ExtensionURLInfo& info) const {
   if (info.origin().isUnique() || IsSandboxedPage(info))