Hookup the escape key on Linux Omnibox to revert to the permanent text (like Windows).

chrome/browser/autocomplete/autocomplete_edit_view_gtk.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/autocomplete/autocomplete_edit_view_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
 #include "base/gfx/gtk_util.h"
@@ skipping 70 matching lines @@
       NULL, "foreground", kInsecureSchemeColor, NULL);
 
   // NOTE: This code used to connect to "changed", however this was fired too
   // often and during bad times (our own buffer changes?).  It works out much
   // better to listen to end-user-action, which should be fired whenever the
   // user makes some sort of change to the buffer.
   g_signal_connect(text_buffer_, "begin-user-action",
                    G_CALLBACK(&HandleBeginUserActionThunk), this);
   g_signal_connect(text_buffer_, "end-user-action",
                    G_CALLBACK(&HandleEndUserActionThunk), this);
-  // We connect to key press and release for special handling of the enter key.
+  // We connect to key press and release for special handling of a few keys.
   g_signal_connect(text_view_, "key-press-event",
                    G_CALLBACK(&HandleKeyPressThunk), this);
   g_signal_connect(text_view_, "key-release-event",
                    G_CALLBACK(&HandleKeyReleaseThunk), this);
   g_signal_connect(text_view_, "size-request",
                    G_CALLBACK(&HandleViewSizeRequest), this);
   g_signal_connect(text_view_, "button-press-event",
                    G_CALLBACK(&HandleViewButtonPressThunk), this);
   g_signal_connect(text_view_, "focus-in-event",
                    G_CALLBACK(&HandleViewFocusInThunk), this);
@@ skipping 227 matching lines @@
   // GtkTextView key_press default handler.  TODO(deanm): We do however omit
   // some IME related code, this might become a problem if an IME wants to
   // handle enter.  We can get at the im_context and do it ourselves if needed.
   if (event->keyval == GDK_Return ||
       event->keyval == GDK_ISO_Enter ||
       event->keyval == GDK_KP_Enter) {
     bool alt_held = (event->state & GDK_MOD1_MASK);
     model_->AcceptInput(alt_held ? NEW_FOREGROUND_TAB : CURRENT_TAB, false);
     return TRUE;  // Don't propagate into GtkTextView.
   }
+  if (event->keyval == GDK_Escape && event->state == 0) {
+    model_->OnEscapeKeyPressed();
+    return TRUE;  // Don't propagate into GtkTextView.
+  }
   return FALSE;  // Propagate into GtkTextView.
 }
 
 gboolean AutocompleteEditViewGtk::HandleKeyRelease(GtkWidget* widget,
                                                    GdkEventKey* event) {
   // We ate the press, might as well eat the release.
   if (event->keyval == GDK_Return ||
       event->keyval == GDK_ISO_Enter ||
-      event->keyval == GDK_KP_Enter) {
+      event->keyval == GDK_KP_Enter ||
+      (event->keyval == GDK_Escape && event->state == 0)) {
     return TRUE;  // Don't propagate into GtkTextView.
   }
   return FALSE;  // Propagate into GtkTextView.
 }
 
 // static
 void AutocompleteEditViewGtk::HandleViewSizeRequest(GtkWidget* view,
                                                     GtkRequisition* req,
                                                     gpointer unused) {
   // Don't force a minimum size, allow our embedder to size us better.
@@ skipping 136 matching lines @@
                                 &start, &end);
     }
     gtk_widget_modify_base(text_view_, GTK_STATE_NORMAL, background);
   }
 }
 
 void AutocompleteEditViewGtk::TextChanged() {
   EmphasizeURLComponents();
   controller_->OnChanged();
 }