3 files changed, 11 insertions, 6 deletions
diff --git a/chrome/browser/extensions/extension_updater.cc b/chrome/browser/extensions/extension_updater.cc
index 770f9c6..a6a5ca5 100644
--- a/chrome/browser/extensions/extension_updater.cc
+++ b/chrome/browser/extensions/extension_updater.cc
@@ -4,6 +4,9 @@
 
 #include "chrome/browser/extensions/extension_updater.h"
 
+#include <algorithm>
+#include <set>
+
 #include "base/logging.h"
 #include "base/file_util.h"
 #include "base/file_version_info.h"
@@ -537,7 +540,8 @@ void ExtensionUpdater::StartUpdateCheck(const GURL& url) {
   }
 }
 
-void ExtensionUpdater::FetchUpdatedExtension(const std::string& id, GURL url) {
+void ExtensionUpdater::FetchUpdatedExtension(const std::string& id,
+                                             const GURL& url) {
   for (std::deque<ExtensionFetch>::const_iterator iter =
            extensions_pending_.begin();
        iter != extensions_pending_.end(); ++iter) {
diff --git a/chrome/browser/extensions/extension_updater.h b/chrome/browser/extensions/extension_updater.h
index 5af2c03..3973b4e 100644
--- a/chrome/browser/extensions/extension_updater.h
+++ b/chrome/browser/extensions/extension_updater.h
@@ -92,7 +92,7 @@ class ExtensionUpdater
     std::string id;
     GURL url;
     ExtensionFetch() : id(""), url() {}
-    ExtensionFetch(std::string i, GURL u) : id(i), url(u) {}
+    ExtensionFetch(const std::string& i, const GURL& u) : id(i), url(u) {}
   };
 
   // These are needed for unit testing, to help identify the correct mock
@@ -139,7 +139,7 @@ class ExtensionUpdater
   void StartUpdateCheck(const GURL& url);
 
   // Begins (or queues up) download of an updated extension.
-  void FetchUpdatedExtension(const std::string& id, GURL url);
+  void FetchUpdatedExtension(const std::string& id, const GURL& url);
 
   typedef std::vector<ParseResult*> ParseResultList;
 
diff --git a/chrome/browser/extensions/extension_updater_unittest.cc b/chrome/browser/extensions/extension_updater_unittest.cc
index 55acce7..999adbd 100644
--- a/chrome/browser/extensions/extension_updater_unittest.cc
+++ b/chrome/browser/extensions/extension_updater_unittest.cc
@@ -205,9 +205,10 @@ class ExtensionUpdaterTest : public testing::Test {
   }
 
   // Make a test ParseResult
-  static ExtensionUpdater::ParseResult* MakeParseResult(std::string id,
-                                                        std::string version,
-                                                        std::string url) {
+  static ExtensionUpdater::ParseResult* MakeParseResult(
+      const std::string& id,
+      const std::string& version,
+      const std::string& url) {
     ExtensionUpdater::ParseResult *result = new ExtensionUpdater::ParseResult;
     result->extension_id = id;
     result->version.reset(Version::GetVersionFromString(version));