Fix extension command service to check if user has modified key before overwrite on update.

chrome/browser/extensions/api/commands/command_service.cc

Index: chrome/browser/extensions/api/commands/command_service.cc
diff --git a/chrome/browser/extensions/api/commands/command_service.cc b/chrome/browser/extensions/api/commands/command_service.cc
index 3fd21e6a724e087da8265b2c2ab77eeead9164f5..33a522e04104bb5816b4e2fcae386448c0a9715d 100644
--- a/chrome/browser/extensions/api/commands/command_service.cc
+++ b/chrome/browser/extensions/api/commands/command_service.cc
@@ -550,15 +550,15 @@ void CommandService::AssignKeybindings(const Extension* extension) {
 
 bool CommandService::CanAutoAssign(const Command &command,
                                    const Extension* extension) {
-  // Media Keys are non-exclusive, so allow auto-assigning them.
-  if (Command::IsMediaKey(command.accelerator()))
-    return true;
-
   // Extensions are allowed to auto-assign updated keys if the user has not
   // changed from the previous value.
   if (IsCommandShortcutUserModified(extension, command.command_name()))
     return false;
 
+  // Media Keys are non-exclusive, so allow auto-assigning them.
+  if (Command::IsMediaKey(command.accelerator()))
+    return true;
+
   if (command.global()) {
     using namespace extensions;
     if (command.command_name() == manifest_values::kBrowserActionCommandEvent ||