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, 3 insertions, 3 deletions

diff --git a/dbus/message_unittest.cc b/dbus/message_unittest.cc
index 7e4455a8..383e1c1 100644
--- a/dbus/message_unittest.cc
+++ b/dbus/message_unittest.cc
@@ -557,7 +557,7 @@ TEST(MessageTest, GetAndSetHeaders) {
   scoped_ptr<dbus::Response> message(dbus::Response::CreateEmpty());
 
   EXPECT_EQ("", message->GetDestination());
-  EXPECT_EQ(dbus::ObjectPath(""), message->GetPath());
+  EXPECT_EQ(dbus::ObjectPath(std::string()), message->GetPath());
   EXPECT_EQ("", message->GetInterface());
   EXPECT_EQ("", message->GetMember());
   EXPECT_EQ("", message->GetErrorName());
@@ -587,7 +587,7 @@ TEST(MessageTest, GetAndSetHeaders) {
 TEST(MessageTest, SetInvalidHeaders) {
   scoped_ptr<dbus::Response> message(dbus::Response::CreateEmpty());
   EXPECT_EQ("", message->GetDestination());
-  EXPECT_EQ(dbus::ObjectPath(""), message->GetPath());
+  EXPECT_EQ(dbus::ObjectPath(std::string()), message->GetPath());
   EXPECT_EQ("", message->GetInterface());
   EXPECT_EQ("", message->GetMember());
   EXPECT_EQ("", message->GetErrorName());
@@ -607,7 +607,7 @@ TEST(MessageTest, SetInvalidHeaders) {
   EXPECT_FALSE(message->SetSender("?!#*"));
 
   EXPECT_EQ("", message->GetDestination());
-  EXPECT_EQ(dbus::ObjectPath(""), message->GetPath());
+  EXPECT_EQ(dbus::ObjectPath(std::string()), message->GetPath());
   EXPECT_EQ("", message->GetInterface());
   EXPECT_EQ("", message->GetMember());
   EXPECT_EQ("", message->GetErrorName());