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

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

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193020 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2 insertions, 2 deletions

diff --git a/chrome/browser/policy/cloud/cloud_policy_refresh_scheduler_unittest.cc b/chrome/browser/policy/cloud/cloud_policy_refresh_scheduler_unittest.cc
index 269ca75..9f3c403 100644
--- a/chrome/browser/policy/cloud/cloud_policy_refresh_scheduler_unittest.cc
+++ b/chrome/browser/policy/cloud/cloud_policy_refresh_scheduler_unittest.cc
@@ -127,7 +127,7 @@ TEST_F(CloudPolicyRefreshSchedulerTest, InitialRefreshManagedAlreadyFetched) {
 }
 
 TEST_F(CloudPolicyRefreshSchedulerTest, Unregistered) {
-  client_.SetDMToken("");
+  client_.SetDMToken(std::string());
   scoped_ptr<CloudPolicyRefreshScheduler> scheduler(CreateRefreshScheduler());
   client_.NotifyPolicyFetched();
   client_.NotifyRegistrationStateChanged();
@@ -182,7 +182,7 @@ TEST_F(CloudPolicyRefreshSchedulerSteadyStateTest, OnRegistrationStateChanged) {
   EXPECT_EQ(GetLastDelay(), base::TimeDelta());
 
   task_runner_->ClearPendingTasks();
-  client_.SetDMToken("");
+  client_.SetDMToken(std::string());
   client_.NotifyRegistrationStateChanged();
   EXPECT_TRUE(task_runner_->GetPendingTasks().empty());
 }