[Mac] Revert diagnostics for content popup bug.

chrome/browser/renderer_host/render_widget_host_view_mac.mm

Index: chrome/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/chrome/browser/renderer_host/render_widget_host_view_mac.mm b/chrome/browser/renderer_host/render_widget_host_view_mac.mm
index 382fafbf60e04101e730a7212beb2596376b684c..d4409e0137e33757302afec74ea5cd4eb4cc34ea 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/chrome/browser/renderer_host/render_widget_host_view_mac.mm
@@ -445,7 +445,6 @@ void RenderWidgetHostViewMac::ShowPopupWithItems(
 
   if ([menu_runner menuItemWasChosen]) {
     // Simulate a menu selection event.
-    CHECK(cocoa_view_);
     const WebMouseEvent& mouse_event =
         WebInputEventFactory::mouseEvent(event, cocoa_view_);
     render_widget_host_->ForwardMouseEvent(mouse_event);
@@ -602,13 +601,6 @@ void RenderWidgetHostViewMac::SetBackground(const SkBitmap& background) {
   return self;
 }
 
-// Used only to diagnose the crash in http://crbug.com/31716
-// TODO(pamg): Remove when no longer needed.
-- (void)dealloc {
-  renderWidgetHostView_->clear_cocoa_view();
-  [super dealloc];
-}
-
 - (void)setCanBeKeyView:(BOOL)can {
   canBeKeyView_ = can;
 }