Implement a shell of FindRequestManager, and hook it up to WebContentsImpl.

chrome/browser/ui/find_bar/find_tab_helper.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 
 #include <vector>
 
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
@@ skipping 59 matching lines @@
 
   // This is a FindNext operation if we are searching for the same text again,
   // or if the passed in search text is empty (FindNext keyboard shortcut). The
   // exception to this is if the Find was aborted (then we don't want FindNext
   // because the highlighting has been cleared and we need it to reappear). We
   // therefore treat FindNext after an aborted Find operation as a full fledged
   // Find.
   bool find_next = (find_text_ == search_string || search_string.empty()) &&
                    (last_search_case_sensitive_ == case_sensitive) &&
                    !find_op_aborted_;
-  if (!find_next)
-    current_find_request_id_ = find_request_id_counter_++;
+
+  current_find_request_id_ = find_request_id_counter_++;
 
   if (!search_string.empty())
     find_text_ = search_string;
   last_search_case_sensitive_ = case_sensitive;
 
   find_op_aborted_ = false;
 
   // Keep track of what the last search was across the tabs.
   Profile* profile =
       Profile::FromBrowserContext(web_contents()->GetBrowserContext());
@@ skipping 42 matching lines @@
 }
 
 void FindTabHelper::ActivateFindInPageResultForAccessibility() {
   web_contents()->GetMainFrame()->ActivateFindInPageResultForAccessibility(
       current_find_request_id_);
 }
 
 #if defined(OS_ANDROID)
 void FindTabHelper::ActivateNearestFindResult(float x, float y) {
   if (!find_op_aborted_ && !find_text_.empty()) {
-    web_contents()->GetMainFrame()->ActivateNearestFindResult(
-        current_find_request_id_, x, y);
+    web_contents()->ActivateNearestFindResult(x, y);
   }
 }
 
 void FindTabHelper::RequestFindMatchRects(int current_version) {
   if (!find_op_aborted_ && !find_text_.empty())
-    web_contents()->GetMainFrame()->RequestFindMatchRects(current_version);
+    web_contents()->RequestFindMatchRects(current_version);
 }
 #endif
 
 void FindTabHelper::HandleFindReply(int request_id,
                                     int number_of_matches,
                                     const gfx::Rect& selection_rect,
                                     int active_match_ordinal,
                                     bool final_update) {
   // Ignore responses for requests that have been aborted.
   // Ignore responses for requests other than the one we have most recently
@@ skipping 15 matching lines @@
     // found.
     last_search_result_ = FindNotificationDetails(
         request_id, number_of_matches, selection, active_match_ordinal,
         final_update);
     content::NotificationService::current()->Notify(
         chrome::NOTIFICATION_FIND_RESULT_AVAILABLE,
         content::Source<WebContents>(web_contents()),
         content::Details<FindNotificationDetails>(&last_search_result_));
   }
 }