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, 4 insertions, 4 deletions

diff --git a/content/renderer/v8_value_converter_impl_unittest.cc b/content/renderer/v8_value_converter_impl_unittest.cc
index df68e80..1f6b9bf 100644
--- a/content/renderer/v8_value_converter_impl_unittest.cc
+++ b/content/renderer/v8_value_converter_impl_unittest.cc
@@ -70,7 +70,7 @@ class V8ValueConverterImplTest : public testing::Test {
     std::string temp;
     if (!value->GetString(key, &temp)) {
       ADD_FAILURE();
-      return "";
+      return std::string();
     }
     return temp;
   }
@@ -80,7 +80,7 @@ class V8ValueConverterImplTest : public testing::Test {
         value->Get(v8::String::New(key.c_str())).As<v8::String>();
     if (temp.IsEmpty()) {
       ADD_FAILURE();
-      return "";
+      return std::string();
     }
     v8::String::Utf8Value utf8(temp);
     return std::string(*utf8, utf8.length());
@@ -90,7 +90,7 @@ class V8ValueConverterImplTest : public testing::Test {
     std::string temp;
     if (!value->GetString(static_cast<size_t>(index), &temp)) {
       ADD_FAILURE();
-      return "";
+      return std::string();
     }
     return temp;
   }
@@ -99,7 +99,7 @@ class V8ValueConverterImplTest : public testing::Test {
     v8::Handle<v8::String> temp = value->Get(index).As<v8::String>();
     if (temp.IsEmpty()) {
       ADD_FAILURE();
-      return "";
+      return std::string();
     }
     v8::String::Utf8Value utf8(temp);
     return std::string(*utf8, utf8.length());