Cleanup: Convert ASCIIToUTF16("") to string16().

chrome/browser/ui/find_bar/find_bar_host_browsertest.cc

Index: chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
diff --git a/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc b/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
index 019a565db672dc506eae1920fc06606afa8ea0c1..7ad819092a7575c0e4c2ae75698d275203bce60f 100644
--- a/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
+++ b/chrome/browser/ui/find_bar/find_bar_host_browsertest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
+#include "base/string16.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
@@ -957,7 +958,7 @@ IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, PrepopulateInNewTab) {
   // in the first tab.
   EXPECT_EQ(ASCIIToUTF16("page"), GetFindBarText());
   // But it should not seem like a search has been issued.
-  EXPECT_EQ(ASCIIToUTF16(""), GetMatchCountText());
+  EXPECT_EQ(string16(), GetMatchCountText());
 }
 
 // This makes sure that we can search for A in tabA, then for B in tabB and