Use 'GtkWidget' instead of '*' for default style rule.

It seems that wildcard '*' has higher precedenace than the base class in
style matching. Use 'GtkWidget' is better and we no longer have to explicitly
specify rules for dervied classes.

BUG=chromium-os:7479
TEST=Verify omnibox edit's selection color is still right.

Change-Id: I320efcdcc8066883e859d29a164962bef6754363

Review URL: http://codereview.chromium.org/3684004
diff --git a/resources/gtkrc b/resources/gtkrc
index e34dc32..660e84c 100644
--- a/resources/gtkrc
+++ b/resources/gtkrc
@@ -129,20 +129,14 @@
   bg[ACTIVE]        = "#FFF"
 }
 
-class "*" style "default"
+class "GtkWidget" style "default"
 
 class "GtkNotebook" style "NotebookStyle"
 
 class "GtkEntry" style "TextStyle"
 
-class "GtkViewsEntry" style "TextStyle"
-
 class "GtkTextView" style "TextStyle"
 
-class "GtkViewsTextView" style "TextStyle"
-
-class "GtkUndoView" style "TextStyle"
-
 widget "gtk-tooltip*" style "TooltipStyle"
 
 widget "*.chromeos-options-tab" style "WhiteBackgroundStyle"