browser: Refactor PageInfoModel::Observer into its own header file.

This avoids having a nested class Observer in PageInfoModel.

BUG=None
TEST=None

[email protected],[email protected]

Review URL: http://codereview.chromium.org/7470044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@94344 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index df3d6b4..c8a07c1 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1525,6 +1525,8 @@
         'browser/oom_priority_manager.h',
         'browser/page_info_model.cc',
         'browser/page_info_model.h',
+        'browser/page_info_model_observer.h',
+        'browser/page_info_window.h',
         'browser/parsers/metadata_parser.cc',
         'browser/parsers/metadata_parser.h',
         'browser/parsers/metadata_parser_factory.h',