Move EmptyString, kWhitespace and the BOM to base.

chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc

Index: chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc
diff --git a/chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc b/chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc
index 834db6bde71f26515631978953eda41d665d1892..d08b3a5a92ab06bfbaaafc650cdb20379dd98354 100644
--- a/chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc
+++ b/chrome/browser/ui/gtk/omnibox/omnibox_view_gtk.cc
@@ -500,8 +500,8 @@ void OmniboxViewGtk::SetWindowTextAndCaretPos(const string16& text,
 }
 
 void OmniboxViewGtk::SetForcedQuery() {
-  const string16 current_text(GetText());
-  const size_t start = current_text.find_first_not_of(kWhitespaceUTF16);
+  const base::string16 current_text(GetText());
+  const size_t start = current_text.find_first_not_of(base::kWhitespaceUTF16);
   if (start == string16::npos || (current_text[start] != '?')) {
     SetUserText(ASCIIToUTF16("?"));
   } else {