cocoa: fix a11y labeling & state on search icon

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

Index: chrome/browser/ui/cocoa/location_bar/location_icon_decoration.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_icon_decoration.mm b/chrome/browser/ui/cocoa/location_bar/location_icon_decoration.mm
index ec453049eccf37bdf61df9fe727c1a80030b3add..3aced3c88a788d8f7c94cc027ce96dcf626c428d 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_icon_decoration.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_icon_decoration.mm
@@ -102,7 +102,8 @@
 }
 
 bool LocationIconDecoration::AcceptsMousePress() {
-  return true;
+  // The search icon does not accept mouse presses.
+  return !owner_->GetOmniboxView()->IsEditingOrEmpty();
 }
 
 bool LocationIconDecoration::HasHoverAndPressEffect() {
@@ -131,3 +132,9 @@
   return owner_->GetOmniboxView()->IsEditingOrEmpty() ?
       nil : l10n_util::GetNSStringWithFixup(IDS_TOOLTIP_LOCATION_ICON);
 }
+
+NSString* LocationIconDecoration::GetAccessibilityLabel() {
+  // This button should always be labelled even when the omnibox is being
+  // edited.
+  return l10n_util::GetNSStringWithFixup(IDS_TOOLTIP_LOCATION_ICON);
+}