[Mac] Prevent the field from updating the font panel and any ruler state.

chrome/browser/cocoa/autocomplete_text_field_editor.mm

Index: chrome/browser/cocoa/autocomplete_text_field_editor.mm
diff --git a/chrome/browser/cocoa/autocomplete_text_field_editor.mm b/chrome/browser/cocoa/autocomplete_text_field_editor.mm
index 6e08a6c6463f0da91442043a04413c56ab3da9b7..4e34692f4970653123bcdf2712f079fbd2e5180f 100644
--- a/chrome/browser/cocoa/autocomplete_text_field_editor.mm
+++ b/chrome/browser/cocoa/autocomplete_text_field_editor.mm
@@ -45,4 +45,17 @@
   }
 }
 
+// We have rich text, but it shouldn't be modified by the user, so
+// don't update the font panel.  In theory, -setUsesFontPanel: should
+// accomplish this, but that gets called frequently with YES when
+// NSTextField and NSTextView synchronize their contents.  That is
+// probably unavoidable because in most cases having rich text in the
+// field you probably would expect it to update the font panel.
+- (void)updateFontPanel {
+}
+
+// No ruler bar, so don't update any of that state, either.
+- (void)updateRuler {
+}
+
 @end