[Mac] Fix an ESC key issue with the find bar on Sierra

chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/auto_reset.h"
 #include "base/mac/bundle_locations.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ skipping 249 matching lines @@
 
     return YES;
   } else if (command == @selector(insertLineBreak:)) {
     // Pressing Ctrl-Return
     if (findBarBridge_) {
       findBarBridge_->GetFindBarController()->EndFindSession(
           FindBarController::kActivateSelectionOnPage,
           FindBarController::kClearResultsInFindBox);
     }
     return YES;
+  } else if (command == @selector(cancelOperation:)) {
+    // Pressing ESC.
+    [closeButton_ performClick:nil];
+    return YES;
   } else if (command == @selector(pageUp:) ||
              command == @selector(pageUpAndModifySelection:) ||
              command == @selector(scrollPageUp:) ||
              command == @selector(pageDown:) ||
              command == @selector(pageDownAndModifySelection:) ||
              command == @selector(scrollPageDown:) ||
              command == @selector(scrollToBeginningOfDocument:) ||
              command == @selector(scrollToEndOfDocument:) ||
              command == @selector(moveUp:) ||
              command == @selector(moveDown:)) {
@@ skipping 372 matching lines @@
 }
 
 - (BrowserWindowController*)browserWindowController {
   if (!browser_)
     return nil;
   return [BrowserWindowController
       browserWindowControllerForWindow:browser_->window()->GetNativeWindow()];
 }
 
 @end