Convert implicit scoped_refptr constructor calls to explicit ones, part 1

chrome/browser/themes/browser_theme_provider.cc

Index: chrome/browser/themes/browser_theme_provider.cc
diff --git a/chrome/browser/themes/browser_theme_provider.cc b/chrome/browser/themes/browser_theme_provider.cc
index 134d954ad5bc22e2b8cacb15bf69550a7eb4252a..ae40eef221f8a9f48f2b2f16daeaf3b5e3cf32a9 100644
--- a/chrome/browser/themes/browser_theme_provider.cc
+++ b/chrome/browser/themes/browser_theme_provider.cc
@@ -602,8 +602,8 @@ void BrowserThemeProvider::SaveThemeID(const std::string& id) {
 }
 
 void BrowserThemeProvider::BuildFromExtension(const Extension* extension) {
-  scoped_refptr<BrowserThemePack> pack =
-      BrowserThemePack::BuildFromExtension(extension);
+  scoped_refptr<BrowserThemePack> pack(
+      BrowserThemePack::BuildFromExtension(extension));
   if (!pack.get()) {
     // TODO(erg): We've failed to install the theme; perhaps we should tell the
     // user? http://crbug.com/34780