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..b8f11f0b88ed47dd6c9083c94ba06becf3b130f0 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)

[Peter Kasting, 2016/12/22 00:38:42]

Nit: Remove "!" and reverse arms, so "else" doesn't read like a mental
double-negative.

     frame_->Activate();
+#else
+    // When opening a URL from other application, macOS will activate browser

[Peter Kasting, 2016/12/22 00:38:42]

Nit: other -> another, browser -> the browser

+    // window in case when "Open" action is used, but won't do it in case when

[Peter Kasting, 2016/12/22 00:38:42]

Nit: in case -> in the case (2x)

+    // "Open Behind" is requested. Let's assume macOS handles the activation
+    // for us, just put the window above other browser windows.

[Peter Kasting, 2016/12/22 00:38:42]

Nit: , -> ;

+    frame_->ShowInactive();
+#endif
     return;
   }