Fix the issue of ShellAcceleratorFilter sending accelerators twice for character keys.

ui/aura_shell/shell_accelerator_filter.cc

Index: ui/aura_shell/shell_accelerator_filter.cc
diff --git a/ui/aura_shell/shell_accelerator_filter.cc b/ui/aura_shell/shell_accelerator_filter.cc
index d64a02f87c64d9d629e03e551f06369ae07e6808..1a971220b406af726df2c2986ed528abb5e0a5a1 100644
--- a/ui/aura_shell/shell_accelerator_filter.cc
+++ b/ui/aura_shell/shell_accelerator_filter.cc
@@ -35,11 +35,10 @@ ShellAcceleratorFilter::~ShellAcceleratorFilter() {
 
 bool ShellAcceleratorFilter::PreHandleKeyEvent(aura::Window* target,
                                                aura::KeyEvent* event) {
-  if (event->type() == ui::ET_KEY_PRESSED &&
-      Shell::GetInstance()->accelerator_controller()->Process(
-          ui::Accelerator(event->key_code(),
-                          event->flags() & kModifierFlagMask))) {
-    return true;
+  if (event->type() == ui::ET_KEY_PRESSED && !event->is_char()) {
+    return Shell::GetInstance()->accelerator_controller()->Process(
+        ui::Accelerator(event->key_code(),
+                        event->flags() & kModifierFlagMask));
   }
   return false;
 }