Carnitas: Refactor about_ipc_dialog header

This change puts the AboutIPCDialog::RunDialog() function into common cross platform header.

BUG=None
TEST=Opened the IPC dialog on my Mac.


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72598 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index cccf05f2..c6f329a 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2626,6 +2626,7 @@
         'browser/ui/app_modal_dialogs/native_app_modal_dialog.h',
         'browser/ui/browser.cc',
         'browser/ui/browser.h',
+        'browser/ui/browser_dialogs.h',
         'browser/ui/browser_init.cc',
         'browser/ui/browser_init.h',
         'browser/ui/browser_list_gtk.cc',