GTK: Remove the global bookmarks menu. It can't be implemented efficiently.

chrome/browser/ui/gtk/global_history_menu.cc

Index: chrome/browser/ui/gtk/global_history_menu.cc
diff --git a/chrome/browser/ui/gtk/global_history_menu.cc b/chrome/browser/ui/gtk/global_history_menu.cc
index 349d6eac57e02b9c00463c360b92817a65ffc518..faefe1eab4603f9d6f37d9d1fd0904200a2f779e 100644
--- a/chrome/browser/ui/gtk/global_history_menu.cc
+++ b/chrome/browser/ui/gtk/global_history_menu.cc
@@ -32,10 +32,10 @@
 namespace {
 
 // The maximum number of most visited items to display.
-const unsigned int kMostVisitedCount = 12;
+const unsigned int kMostVisitedCount = 8;
 
 // The number of recently closed items to get.
-const unsigned int kRecentlyClosedCount = 10;
+const unsigned int kRecentlyClosedCount = 8;
 
 // Menus more than this many chars long will get trimmed.
 const int kMaximumMenuWidthInChars = 50;