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

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

Index: chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
diff --git a/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm b/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
index 9fb09a4b0a97e12e914e7c53dd500e98ce91ebbd..967cb4b228a69ece151d374b2eb472543e0f58e7 100644
--- a/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
+++ b/chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_controller.mm
@@ -267,6 +267,10 @@ const float kRightEdgeOffset = 25;
           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:) ||