On macOS, avoid forcible activation during Show.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index e34983dae09a4faf5753142b2ef8d19836919241..de9da11bdd2ac711af3d2671ba4a1b554c6605aa 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -606,7 +606,15 @@ void BrowserView::Show() {
 
   // If the window is already visible, just activate it.
   if (frame_->IsVisible()) {
+#if defined(OS_MACOSX)
+    // When opening a URL from another application, macOS will activate the
+    // browser window in the case when "Open" action is used, but won't do it
+    // in the case when "Open Behind" is requested. Let's assume macOS handles
+    // the activation for us; just put the window above other browser windows.
+    frame_->ShowInactive();
+#else
     frame_->Activate();
+#endif
     return;
   }