theme: Unbind GtkTextView's Ctrl-Shift-Delete accelerator.

resources/gtkrc

 gtk_color_scheme = "fg_color:#000\nbg_color:#F7F7F7\nbase_color:#F7F7F7\ntext_color:#000\nselected_bg_color:#000\nselected_fg_color:#000\ntooltip_bg_color:#F7F7F7\ntooltip_fg_color:#000\n"
 
 gtk-font-name="ChromeDroidSans 9"
 
 # Disable menu and button icons.
 gtk-menu-images = 0
 gtk-button-images = 0
 
 # Diable mnemonics for labels and menu items.
 gtk-enable-mnemonics = 0
@@ skipping 126 matching lines @@
 class "GtkEntry" style "TextStyle"
 
 class "GtkTextView" style "TextStyle"
 
 widget "gtk-tooltip*" style "TooltipStyle"
 
 widget "*.chromeos-options-tab" style "WhiteBackgroundStyle"
 
 widget "*.chromeos-options-tab*.GtkEventBox" style "WhiteBackgroundStyle"
 
+# NOTE: The keysym names in the below bindings are case-sensitive; they
+# must match the corresponding GDK #defines, e.g. GDK_slash, GDK_Delete,
+# etc.  (The modifier names are case-insensitive, though.)
+
 # GTK+ hardcodes Ctrl-/ to select all text, just like Ctrl-A.  Unbind it
 # here so we can bind it ourselves to do something else in Chrome.
 binding "UnbindControlSlash" {
-  unbind "<Control>slash"
+  unbind "<control>slash"
 }
 class "*" binding "UnbindControlSlash"
+
+# GtkTextView binds Ctrl-Shift-Delete to delete all text to the end of the
+# current paragraph.  We unbind it here so it can be used to open the
+# "Clear Browsing Data" dialog while the omnibox has the focus.
+binding "UnbindControlShiftDelete" {
+  unbind "<control><shift>Delete"
+}
+class "*" binding "UnbindControlShiftDelete"