components: Create web_modal component.

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
diff --git a/chrome/browser/ui/browser_window.h b/chrome/browser/ui/browser_window.h
index ec2521b50ada8da9c80b5531addafdb1725ea7ae..23a0ae24c1fb7e66b2e6cfcd595c6b13f02f0620 100644
--- a/chrome/browser/ui/browser_window.h
+++ b/chrome/browser/ui/browser_window.h
@@ -28,7 +28,6 @@ class TemplateURL;
 #if !defined(OS_MACOSX)
 class ToolbarView;
 #endif
-class WebContentsModalDialogHost;
 
 namespace autofill {
 class PasswordGenerator;
@@ -49,6 +48,10 @@ class Rect;
 class Size;
 }
 
+namespace web_modal {
+class WebContentsModalDialogHost;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserWindow interface
 //  An interface implemented by the "view" of the Browser window.
@@ -326,7 +329,8 @@ class BrowserWindow : public BaseWindow {
 
   // Return the WebContentsModalDialogHost for use in positioning web contents
   // modal dialogs within the browser window.
-  virtual WebContentsModalDialogHost* GetWebContentsModalDialogHost() = 0;
+  virtual web_modal::WebContentsModalDialogHost*
+      GetWebContentsModalDialogHost() = 0;
 
   // Invoked when the preferred size of the contents in current tab has been
   // changed. We might choose to update the window size to accomodate this