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

resources/gtkrc

Index: resources/gtkrc
diff --git a/resources/gtkrc b/resources/gtkrc
index 1c945ba8904d9d6c39a33ea14590314ec30a817c..a739318c81ae9cfc030e62354addb43dfeaf5b3d 100644
--- a/resources/gtkrc
+++ b/resources/gtkrc
@@ -144,9 +144,21 @@ 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"