Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/extensions/extension_browsertest.cc

Index: chrome/browser/extensions/extension_browsertest.cc
diff --git a/chrome/browser/extensions/extension_browsertest.cc b/chrome/browser/extensions/extension_browsertest.cc
index b051df9d0a3d7bdeaca30ad6c6fc22ddbf50e2db..cfad60e49fe7db51c70cbae3a6627dd6766d4360 100644
--- a/chrome/browser/extensions/extension_browsertest.cc
+++ b/chrome/browser/extensions/extension_browsertest.cc
@@ -337,9 +337,13 @@ class MockAutoConfirmExtensionInstallPrompt : public ExtensionInstallPrompt {
 const Extension* ExtensionBrowserTest::InstallExtensionFromWebstore(
     const base::FilePath& path,
     int expected_change) {
-  return InstallOrUpdateExtension("", path, INSTALL_UI_TYPE_NONE,
-                                  expected_change, Manifest::INTERNAL,
-                                  browser(), true);
+  return InstallOrUpdateExtension(std::string(),
+                                  path,
+                                  INSTALL_UI_TYPE_NONE,
+                                  expected_change,
+                                  Manifest::INTERNAL,
+                                  browser(),
+                                  true);
 }
 
 const Extension* ExtensionBrowserTest::InstallOrUpdateExtension(