components: Create web_modal component.

components/web_modal/web_contents_modal_dialog_host.h

Index: components/web_modal/web_contents_modal_dialog_host.h
diff --git a/chrome/browser/ui/web_contents_modal_dialog_host.h b/components/web_modal/web_contents_modal_dialog_host.h
similarity index 83%
rename from chrome/browser/ui/web_contents_modal_dialog_host.h
rename to components/web_modal/web_contents_modal_dialog_host.h
index 183246c883925b94d6f8490342cc6f1a2c50499c..7c1a3715af8ef45f15edaab514172f19b1c80c0f 100644
--- a/chrome/browser/ui/web_contents_modal_dialog_host.h
+++ b/components/web_modal/web_contents_modal_dialog_host.h
@@ -2,12 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
-#define CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
+#ifndef COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
+#define COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
 
 #include "ui/gfx/point.h"
 #include "ui/gfx/size.h"
 
+namespace web_modal {
+
 // Observer to be implemented to update web contents modal dialogs when the host
 // indicates their position needs to be changed.
 class WebContentsModalDialogHostObserver {
@@ -42,4 +44,6 @@ class WebContentsModalDialogHost {
   DISALLOW_COPY_AND_ASSIGN(WebContentsModalDialogHost);
 };
 
-#endif  // CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
+}  // namespace web_modal
+
+#endif  // COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_