Convert string16 to use base namespace.

TBR=sky

Review URL: https://codereview.chromium.org/109233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239538 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/context_menu_matcher.cc b/chrome/browser/extensions/context_menu_matcher.cc
index 80f7bd7..6f03d6a 100644
--- a/chrome/browser/extensions/context_menu_matcher.cc
+++ b/chrome/browser/extensions/context_menu_matcher.cc
@@ -27,10 +27,10 @@
       filter_(filter) {
 }
 
-void ContextMenuMatcher::AppendExtensionItems(const std::string& extension_id,
-                                              const string16& selection_text,
-                                              int* index)
-{
+void ContextMenuMatcher::AppendExtensionItems(
+    const std::string& extension_id,
+    const base::string16& selection_text,
+    int* index) {
   DCHECK_GE(*index, 0);
   int max_index =
       IDC_EXTENSIONS_CONTEXT_CUSTOM_LAST - IDC_EXTENSIONS_CONTEXT_CUSTOM_FIRST;
@@ -61,7 +61,7 @@
                                     menu_model_, index);
   } else {
     int menu_id = IDC_EXTENSIONS_CONTEXT_CUSTOM_FIRST + (*index)++;
-    string16 title;
+    base::string16 title;
     MenuItem::List submenu_items;
 
     if (items.size() > 1 || items[0]->type() != MenuItem::NORMAL) {
@@ -97,7 +97,7 @@
 
 base::string16 ContextMenuMatcher::GetTopLevelContextMenuTitle(
     const std::string& extension_id,
-    const string16& selection_text) {
+    const base::string16& selection_text) {
   const Extension* extension = NULL;
   MenuItem::List items;
   bool can_cross_incognito;
@@ -189,7 +189,7 @@
 void ContextMenuMatcher::RecursivelyAppendExtensionItems(
     const MenuItem::List& items,
     bool can_cross_incognito,
-    const string16& selection_text,
+    const base::string16& selection_text,
     ui::SimpleMenuModel* menu_model,
     int* index)
 {
@@ -212,7 +212,7 @@
     if (menu_id >= IDC_EXTENSIONS_CONTEXT_CUSTOM_LAST)
       return;
     extension_item_map_[menu_id] = item->id();
-    string16 title = item->TitleWithReplacement(selection_text,
+    base::string16 title = item->TitleWithReplacement(selection_text,
                                                 kMaxExtensionItemTitleLength);
     if (item->type() == MenuItem::NORMAL) {
       MenuItem::List children =