browser: Abstract message box dialog functions into its own header file.

chrome/browser/platform_util_win.cc

Index: chrome/browser/platform_util_win.cc
diff --git a/chrome/browser/platform_util_win.cc b/chrome/browser/platform_util_win.cc
index a5492132a8526f4bc04b1af076de2dfbdd14f655..a11cc13cc8b18024cbb7f5aab6f21617628672ea 100644
--- a/chrome/browser/platform_util_win.cc
+++ b/chrome/browser/platform_util_win.cc
@@ -18,7 +18,6 @@
 #include "base/win/scoped_comptr.h"
 #include "chrome/common/scoped_co_mem.h"
 #include "googleurl/src/gurl.h"
-#include "ui/base/message_box_win.h"
 #include "ui/base/win/shell.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ -177,18 +176,4 @@ bool IsVisible(gfx::NativeView view) {
   return ::IsWindowVisible(view) != 0;
 }
 
-void SimpleErrorBox(gfx::NativeWindow parent,
-                    const string16& title,
-                    const string16& message) {
-  ui::MessageBox(parent, message, title,
-                 MB_OK | MB_SETFOREGROUND | MB_ICONWARNING | MB_TOPMOST);
-}
-
-bool SimpleYesNoBox(gfx::NativeWindow parent,
-                    const string16& title,
-                    const string16& message) {
-  return ui::MessageBox(parent, message.c_str(), title.c_str(),
-      MB_YESNO | MB_ICONWARNING | MB_SETFOREGROUND) == IDYES;
-}
-
 }  // namespace platform_util