Add base:: to string16s in android_webview/.

android_webview/browser/find_helper.cc

Index: android_webview/browser/find_helper.cc
diff --git a/android_webview/browser/find_helper.cc b/android_webview/browser/find_helper.cc
index 15ae0acecda206aa209b9145f0e0750a8e7a6994..bf6f71206d4259e3d57a9b319660035b7faf1855 100644
--- a/android_webview/browser/find_helper.cc
+++ b/android_webview/browser/find_helper.cc
@@ -35,7 +35,7 @@ void FindHelper::SetListener(Listener* listener) {
   listener_ = listener;
 }
 
-void FindHelper::FindAllAsync(const string16& search_string) {
+void FindHelper::FindAllAsync(const base::string16& search_string) {
   // Stop any ongoing asynchronous request.
   web_contents()->GetRenderViewHost()->StopFinding(
       content::STOP_FIND_ACTION_KEEP_SELECTION);
@@ -90,7 +90,7 @@ void FindHelper::ClearMatches() {
   last_active_ordinal_ = -1;
 }
 
-void FindHelper::StartNewRequest(const string16& search_string) {
+void FindHelper::StartNewRequest(const base::string16& search_string) {
   current_request_id_ = find_request_id_counter_++;
   last_search_string_ = search_string;
   last_match_count_ = -1;