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

chrome/renderer/extensions/chrome_v8_context.cc

Index: chrome/renderer/extensions/chrome_v8_context.cc
diff --git a/chrome/renderer/extensions/chrome_v8_context.cc b/chrome/renderer/extensions/chrome_v8_context.cc
index b4ae80e30ef264d50310a403db48c32eec0f7231..5feff00051e05737eb9511ff939e01e70f4c0caf 100644
--- a/chrome/renderer/extensions/chrome_v8_context.cc
+++ b/chrome/renderer/extensions/chrome_v8_context.cc
@@ -63,7 +63,7 @@ void ChromeV8Context::Invalidate() {
 }
 
 std::string ChromeV8Context::GetExtensionID() {
-  return extension_ ? extension_->id() : "";
+  return extension_ ? extension_->id() : std::string();
 }
 
 // static
@@ -187,7 +187,7 @@ std::string ChromeV8Context::GetContextTypeDescription() {
     case Feature::WEB_PAGE_CONTEXT:            return "WEB_PAGE";
   }
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 ChromeV8Context* ChromeV8Context::GetContext() {