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, 5 deletions

diff --git a/chrome/browser/extensions/api/extension_action/browser_action_apitest.cc b/chrome/browser/extensions/api/extension_action/browser_action_apitest.cc
index 0a5497f..07845e4 100644
--- a/chrome/browser/extensions/api/extension_action/browser_action_apitest.cc
+++ b/chrome/browser/extensions/api/extension_action/browser_action_apitest.cc
@@ -692,11 +692,9 @@ IN_PROC_BROWSER_TEST_F(BrowserActionApiTest, TestTriggerBrowserAction) {
       "window.domAutomationController.send(document.body.style."
       "backgroundColor);";
   std::string result;
-  const std::string frame_xpath = "";
-  EXPECT_TRUE(content::ExecuteScriptInFrameAndExtractString(tab,
-                                                            frame_xpath,
-                                                            script,
-                                                            &result));
+  const std::string frame_xpath;
+  EXPECT_TRUE(content::ExecuteScriptInFrameAndExtractString(
+      tab, frame_xpath, script, &result));
   EXPECT_EQ(result, "red");
 }