Inject CanAddURLToHistory into TopSitesImpl

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
index 66a1bc232f001c016b118512bb833eb1192f8859..d4aebcc0dd4736295f3f9f5222d27df9836fa7f4 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
@@ -214,8 +214,6 @@ void OmniboxViewMac::ResetTabState(WebContents* web_contents) {
 }
 
 void OmniboxViewMac::Update() {
-  UpdatePlaceholderText();
-
   if (model()->UpdatePermanentText()) {
     // Something visibly changed.  Re-enable URL replacement.
     controller()->GetToolbarModel()->set_url_replacement_enabled(true);
@@ -237,20 +235,6 @@ void OmniboxViewMac::Update() {
   }
 }
 
-void OmniboxViewMac::UpdatePlaceholderText() {
-  if (OmniboxFieldTrial::DisplayHintTextWhenPossible()) {
-    NSDictionary* placeholder_attributes = @{
-      NSForegroundColorAttributeName : [NSColor disabledControlTextColor]
-    };
-    base::scoped_nsobject<NSMutableAttributedString> placeholder_text(
-        [[NSMutableAttributedString alloc]
-            initWithString:base::SysUTF16ToNSString(GetHintText())
-                attributes:placeholder_attributes]);
-    ApplyTextStyle(placeholder_text);
-    [[field_ cell] setPlaceholderAttributedString:placeholder_text];
-  }
-}
-
 void OmniboxViewMac::OpenMatch(const AutocompleteMatch& match,
                                WindowOpenDisposition disposition,
                                const GURL& alternate_nav_url,