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, 3 insertions, 3 deletions

diff --git a/chrome/browser/policy/cloud/device_management_service_unittest.cc b/chrome/browser/policy/cloud/device_management_service_unittest.cc
index ae84965..b83ca80 100644
--- a/chrome/browser/policy/cloud/device_management_service_unittest.cc
+++ b/chrome/browser/policy/cloud/device_management_service_unittest.cc
@@ -513,7 +513,7 @@ TEST_F(DeviceManagementServiceTest, CancelDuringCallback) {
 
   // Generate a callback.
   net::URLRequestStatus status(net::URLRequestStatus::SUCCESS, 0);
-  SendResponse(fetcher, status, 500, "");
+  SendResponse(fetcher, status, 500, std::string());
 
   // Job should have been reset.
   EXPECT_FALSE(request_job.get());
@@ -534,7 +534,7 @@ TEST_F(DeviceManagementServiceTest, RetryOnProxyError) {
   // Generate a callback with a proxy failure.
   net::URLRequestStatus status(net::URLRequestStatus::FAILED,
                                net::ERR_PROXY_CONNECTION_FAILED);
-  SendResponse(fetcher, status, 200, "");
+  SendResponse(fetcher, status, 200, std::string());
 
   // Verify that a new URLFetcher was started that bypasses the proxy.
   fetcher = GetFetcher();
@@ -564,7 +564,7 @@ TEST_F(DeviceManagementServiceTest, RetryOnBadResponseFromProxy) {
   // Generate a callback with a valid http response, that was generated by
   // a bad/wrong proxy.
   net::URLRequestStatus status;
-  SendResponse(fetcher, status, 200, "");
+  SendResponse(fetcher, status, 200, std::string());
 
   // Verify that a new URLFetcher was started that bypasses the proxy.
   fetcher = GetFetcher();