Mac: Clicking an omnibox decoration should not highlight the omnibox.

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
index 6c25cc82855b4c1f9dfe9e570a413e9aaf04c648..08884d2f44817dea742adfea54bf9f9002660ec7 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field.mm
@@ -397,6 +397,16 @@ const CGFloat kAnimationDuration = 0.2;
 
 // (Overridden from NSResponder)
 - (BOOL)becomeFirstResponder {
+  // If the event is a left-mouse click, and it lands on a decoration, then the
+  // event should not cause the text field to become first responder.
+  NSEvent* event = [NSApp currentEvent];
+  if ([event type] == NSLeftMouseDown) {
+    LocationBarDecoration* decoration =
+        [[self cell] decorationForEvent:event inRect:[self bounds] ofView:self];
+    if (decoration)
+      return NO;
+  }
+
   BOOL doAccept = [super becomeFirstResponder];
   if (doAccept) {
     [[BrowserWindowController browserWindowControllerForView:self]