Remove page IDs from three WebContentsObserver APIs that don't need it.

chrome/browser/favicon/favicon_tab_helper.cc

Index: chrome/browser/favicon/favicon_tab_helper.cc
diff --git a/chrome/browser/favicon/favicon_tab_helper.cc b/chrome/browser/favicon/favicon_tab_helper.cc
index 542c634073cbf2b77e6bdadf792f9a5a0ddae344..a6a7bb84c9411a7ebe413518e51eaf73fca916f9 100644
--- a/chrome/browser/favicon/favicon_tab_helper.cc
+++ b/chrome/browser/favicon/favicon_tab_helper.cc
@@ -191,14 +191,13 @@ void FaviconTabHelper::DidNavigateMainFrame(
 }
 
 void FaviconTabHelper::DidUpdateFaviconURL(
-    int32 page_id,
     const std::vector<content::FaviconURL>& candidates) {
   DCHECK(!candidates.empty());
   favicon_urls_ = candidates;
 
-  favicon_handler_->OnUpdateFaviconURL(page_id, candidates);
+  favicon_handler_->OnUpdateFaviconURL(candidates);
   if (touch_icon_handler_.get())
-    touch_icon_handler_->OnUpdateFaviconURL(page_id, candidates);
+    touch_icon_handler_->OnUpdateFaviconURL(candidates);
 }
 
 FaviconService* FaviconTabHelper::GetFaviconService() {