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

This patch was generated by running the empty_string clang tool
across the Chromium Linux compilation database. Implicitly or
explicitly constructing std::string() with a "" argument is
inefficient as the caller needs to emit extra instructions to
pass an argument, and the constructor needlessly copies a byte
into internal storage. Rewriting these instances to simply call
the default constructor appears to save ~14-18 kilobytes on an
optimized release build.

BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=193020

Review URL: https://codereview.chromium.org/13145003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193040 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 9 deletions

diff --git a/google_apis/gaia/oauth2_mint_token_flow.cc b/google_apis/gaia/oauth2_mint_token_flow.cc
index 42fc4ef..169d187 100644
--- a/google_apis/gaia/oauth2_mint_token_flow.cc
+++ b/google_apis/gaia/oauth2_mint_token_flow.cc
@@ -89,17 +89,16 @@ OAuth2MintTokenFlow::Parameters::Parameters(
 
 OAuth2MintTokenFlow::Parameters::~Parameters() {}
 
-OAuth2MintTokenFlow::OAuth2MintTokenFlow(
-    URLRequestContextGetter* context,
-    Delegate* delegate,
-    const Parameters& parameters)
-    : OAuth2ApiCallFlow(
-          context, parameters.login_refresh_token,
-          "", std::vector<std::string>()),
+OAuth2MintTokenFlow::OAuth2MintTokenFlow(URLRequestContextGetter* context,
+                                         Delegate* delegate,
+                                         const Parameters& parameters)
+    : OAuth2ApiCallFlow(context,
+                        parameters.login_refresh_token,
+                        std::string(),
+                        std::vector<std::string>()),
       delegate_(delegate),
       parameters_(parameters),
-      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
-}
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {}
 
 OAuth2MintTokenFlow::~OAuth2MintTokenFlow() { }