[Mac] Re-enable decoration tooltips in omnibox.

chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.mm

Index: chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.mm
diff --git a/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.mm b/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.mm
index 1d5466aa74b11d973a5fb81515469dbb8c626f01..1f2b9acc85042b4e91484b915ea0d5f07455d79f 100644
--- a/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.mm
+++ b/chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.mm
@@ -687,4 +687,19 @@ void CalculatePositionsInFrame(
   return NSDragOperationCopy;
 }
 
+- (void)updateToolTipsInRect:(NSRect)cellFrame
+                      ofView:(AutocompleteTextField*)controlView {
+  std::vector<LocationBarDecoration*> decorations;
+  std::vector<NSRect> decorationFrames;
+  NSRect textFrame;
+  CalculatePositionsInFrame(cellFrame, leftDecorations_, rightDecorations_,
+                            &decorations, &decorationFrames, &textFrame);
+
+  for (size_t i = 0; i < decorations.size(); ++i) {
+    NSString* tooltip = decorations[i]->GetToolTip();
+    if ([tooltip length] > 0)
+      [controlView addToolTip:tooltip forRect:decorationFrames[i]];
+  }
+}
+
 @end