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

google_apis/gaia/oauth_request_signer.cc

Index: google_apis/gaia/oauth_request_signer.cc
diff --git a/google_apis/gaia/oauth_request_signer.cc b/google_apis/gaia/oauth_request_signer.cc
index b5d138f391b6270ef14797b6af9b45d516253f4c..b78cffe50527b0ecdca6a4e8101c6cbb60949ad1 100644
--- a/google_apis/gaia/oauth_request_signer.cc
+++ b/google_apis/gaia/oauth_request_signer.cc
@@ -89,7 +89,7 @@ std::string BuildBaseString(const GURL& request_base_url,
 
 std::string BuildBaseStringParameters(
     const OAuthRequestSigner::Parameters& parameters) {
-  std::string result = "";
+  std::string result = std::string();
   OAuthRequestSigner::Parameters::const_iterator cursor;
   OAuthRequestSigner::Parameters::const_iterator limit;
   bool first = true;
@@ -297,7 +297,7 @@ bool SignParameters(const GURL& request_base_url,
 // static
 bool OAuthRequestSigner::Decode(const std::string& text,
                                 std::string* decoded_text) {
-  std::string accumulator = "";
+  std::string accumulator = std::string();
   std::string::const_iterator cursor;
   std::string::const_iterator limit;
   for (limit = text.end(), cursor = text.begin(); cursor != limit; ++cursor) {
@@ -335,7 +335,7 @@ bool OAuthRequestSigner::Decode(const std::string& text,
 
 // static
 std::string OAuthRequestSigner::Encode(const std::string& text) {
-  std::string result = "";
+  std::string result = std::string();
   std::string::const_iterator cursor;
   std::string::const_iterator limit;
   for (limit = text.end(), cursor = text.begin(); cursor != limit; ++cursor) {