components: Create web_modal component.

components/web_modal/web_contents_modal_dialog_host.cc

Index: components/web_modal/web_contents_modal_dialog_host.cc
diff --git a/chrome/browser/ui/web_contents_modal_dialog_host.cc b/components/web_modal/web_contents_modal_dialog_host.cc
similarity index 79%
rename from chrome/browser/ui/web_contents_modal_dialog_host.cc
rename to components/web_modal/web_contents_modal_dialog_host.cc
index dfbeb2729c429d9b4c467ffc0d68675ac88fc53a..1dcaa00508e4b7727ba784dccf86fd87f147509e 100644
--- a/chrome/browser/ui/web_contents_modal_dialog_host.cc
+++ b/components/web_modal/web_contents_modal_dialog_host.cc
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/web_contents_modal_dialog_host.h"
+#include "components/web_modal/web_contents_modal_dialog_host.h"
+
+namespace web_modal {
 
 WebContentsModalDialogHostObserver::~WebContentsModalDialogHostObserver() {
 }
@@ -15,3 +17,5 @@ WebContentsModalDialogHost::~WebContentsModalDialogHost() {
 
 WebContentsModalDialogHost::WebContentsModalDialogHost() {
 }
+
+}  // namespace web_modal