Rename JavaScript "messages" to "dialogs".

content/shell/browser/shell_javascript_dialog_mac.mm

Index: content/shell/browser/shell_javascript_dialog_mac.mm
diff --git a/content/shell/browser/shell_javascript_dialog_mac.mm b/content/shell/browser/shell_javascript_dialog_mac.mm
index 73b0f4bfd63d46bf23839fcb2846615d00ccb9cc..ba3199a717869145dbc869080ea18a72fb2c7947 100644
--- a/content/shell/browser/shell_javascript_dialog_mac.mm
+++ b/content/shell/browser/shell_javascript_dialog_mac.mm
@@ -89,13 +89,13 @@ namespace content {
 ShellJavaScriptDialog::ShellJavaScriptDialog(
     ShellJavaScriptDialogManager* manager,
     gfx::NativeWindow parent_window,
-    JavaScriptMessageType message_type,
+    JavaScriptDialogType dialog_type,
     const base::string16& message_text,
     const base::string16& default_prompt_text,
     const JavaScriptDialogManager::DialogClosedCallback& callback)
     : callback_(callback) {
-  bool text_field = message_type == JAVASCRIPT_MESSAGE_TYPE_PROMPT;
-  bool one_button = message_type == JAVASCRIPT_MESSAGE_TYPE_ALERT;
+  bool text_field = dialog_type == JAVASCRIPT_DIALOG_TYPE_PROMPT;
+  bool one_button = dialog_type == JAVASCRIPT_DIALOG_TYPE_ALERT;
 
   helper_ =
       [[ShellJavaScriptDialogHelper alloc] initHelperWithManager:manager