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/components/autofill/browser/wallet/wallet_address_unittest.cc b/components/autofill/browser/wallet/wallet_address_unittest.cc
index 0949c6a..7ac92f7 100644
--- a/components/autofill/browser/wallet/wallet_address_unittest.cc
+++ b/components/autofill/browser/wallet/wallet_address_unittest.cc
@@ -176,7 +176,7 @@ TEST_F(WalletAddressTest, CreateAddressMissingObjectId) {
                   ASCIIToUTF16("administrative_area_name"),
                   ASCIIToUTF16("postal_code_number"),
                   ASCIIToUTF16("phone_number"),
-                  "");
+                  std::string());
   ASSERT_EQ(address, *Address::CreateAddress(*dict_));
 }
 
@@ -243,7 +243,7 @@ TEST_F(WalletAddressTest, CreateDisplayAddress) {
                   ASCIIToUTF16("state"),
                   ASCIIToUTF16("postal_code"),
                   ASCIIToUTF16("phone_number"),
-                  "");
+                  std::string());
   ASSERT_EQ(address, *Address::CreateDisplayAddress(*dict_));
 }
 
@@ -272,7 +272,7 @@ TEST_F(WalletAddressTest, ToDictionaryWithoutID) {
                   ASCIIToUTF16("administrative_area_name"),
                   ASCIIToUTF16("postal_code_number"),
                   ASCIIToUTF16("phone_number"),
-                  "");
+                  std::string());
 
   EXPECT_TRUE(expected.Equals(address.ToDictionaryWithoutID().get()));
 }