Fix search restart after zero entries (again).

The fix was lost in refactoring that ended up duplicating
the last_find_request_completed_with_no_matches_ member.

BUG=669983

Change-Id: I09229496d183ef3f9b69c6089a6ac3ecd8b5ef82
Reviewed-on: https://chromium-review.googlesource.com/c/1477835Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634599}

third_party/blink/renderer/core/editing/finder/find_task_controller.cc

@@ -301,4 +301,8 @@ void FindTaskController::Trace(Visitor* visitor) {
   visitor->Trace(resume_finding_from_range_);
 }
 
+void FindTaskController::ResetLastFindRequestCompletedWithNoMatches() {
+  last_find_request_completed_with_no_matches_ = false;
+}
+
 }  // namespace blink

third_party/blink/renderer/core/editing/finder/find_task_controller.h

@@ -76,6 +76,8 @@ class CORE_EXPORT FindTaskController final
 
   void Trace(Visitor* visitor);
 
+  void ResetLastFindRequestCompletedWithNoMatches();
+
  private:
   void RequestIdleFindTask(int identifier,
                            const WebString& search_text,

third_party/blink/renderer/core/editing/finder/text_finder.cc

@@ -206,7 +206,7 @@ bool TextFinder::Find(int identifier,
   }
 
   // We found something, so the result of the previous scoping may be outdated.
-  last_find_request_completed_with_no_matches_ = false;
+  find_task_controller_->ResetLastFindRequestCompletedWithNoMatches();
 
   return true;
 }
@@ -661,7 +661,6 @@ TextFinder::TextFinder(WebLocalFrameImpl& owner_frame)
       find_match_markers_version_(0),
       should_locate_active_rect_(false),
       scoping_in_progress_(false),
-      last_find_request_completed_with_no_matches_(false),
       find_match_rects_are_valid_(false) {}
 
 TextFinder::~TextFinder() = default;

third_party/blink/renderer/core/editing/finder/text_finder.h

@@ -240,10 +240,6 @@ class CORE_EXPORT TextFinder final
   // Keeps track of whether there is an scoping effort ongoing in the frame.
   bool scoping_in_progress_;
 
-  // Keeps track of whether the last find request completed its scoping effort
-  // without finding any matches in this frame.
-  bool last_find_request_completed_with_no_matches_;
-
   // Determines if the rects in the find-in-page matches cache of this frame
   // are invalid and should be recomputed.
   bool find_match_rects_are_valid_;