Rewrite std::string("") to std::string(), Linux edition.

chrome/test/webdriver/webdriver_dispatch_unittest.cc

Index: chrome/test/webdriver/webdriver_dispatch_unittest.cc
diff --git a/chrome/test/webdriver/webdriver_dispatch_unittest.cc b/chrome/test/webdriver/webdriver_dispatch_unittest.cc
index 855711dc76753281d988e7d98ba4417a1053e304..8e75edba8117bfc25162d935a322c51896d41e84 100644
--- a/chrome/test/webdriver/webdriver_dispatch_unittest.cc
+++ b/chrome/test/webdriver/webdriver_dispatch_unittest.cc
@@ -158,7 +158,7 @@ class ParseRequestInfoTest : public testing::Test {
   virtual ~ParseRequestInfoTest() {}
 
   virtual void TearDown() {
-    SessionManager::GetInstance()->set_url_base("");
+    SessionManager::GetInstance()->set_url_base(std::string());
   }
 
  private:
@@ -178,7 +178,7 @@ TEST_F(ParseRequestInfoTest, ParseRequestWithEmptyUrlBase) {
   base::DictionaryValue* parameters;
   Response response;
 
-  SessionManager::GetInstance()->set_url_base("");
+  SessionManager::GetInstance()->set_url_base(std::string());
   EXPECT_TRUE(internal::ParseRequestInfo(
       &request_info,
       NULL,  // NULL is ok because GET not POST is used