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

chrome/browser/extensions/platform_app_browsertest_util.cc

Index: chrome/browser/extensions/platform_app_browsertest_util.cc
diff --git a/chrome/browser/extensions/platform_app_browsertest_util.cc b/chrome/browser/extensions/platform_app_browsertest_util.cc
index 62f8545b7d05757cdc8f5854b84145eb33011ea6..58c2548b3ad3db116b6c8ad863245d58ae0f3c9f 100644
--- a/chrome/browser/extensions/platform_app_browsertest_util.cc
+++ b/chrome/browser/extensions/platform_app_browsertest_util.cc
@@ -142,13 +142,13 @@ ShellWindow* PlatformAppBrowserTest::CreateShellWindow(
     const Extension* extension) {
   ShellWindow::CreateParams params;
   return ShellWindow::Create(
-      browser()->profile(), extension, GURL(""), params);
+      browser()->profile(), extension, GURL(std::string()), params);
 }
 
 ShellWindow* PlatformAppBrowserTest::CreateShellWindowFromParams(
     const Extension* extension, const ShellWindow::CreateParams& params) {
   return ShellWindow::Create(
-      browser()->profile(), extension, GURL(""), params);
+      browser()->profile(), extension, GURL(std::string()), params);
 }
 
 void PlatformAppBrowserTest::CloseShellWindow(ShellWindow* window) {