Rip out browser-side RID caching for most visited items.

chrome/browser/search/search.cc

Index: chrome/browser/search/search.cc
diff --git a/chrome/browser/search/search.cc b/chrome/browser/search/search.cc
index 720c47211cb4990ef8875cf247d1d7e75b99a5d6..b3ac592e9eaaf764cd573fb2aa8bcb6870c69776 100644
--- a/chrome/browser/search/search.cc
+++ b/chrome/browser/search/search.cc
@@ -699,4 +699,18 @@ void ResetInstantExtendedOptInStateGateForTest() {
   instant_extended_opt_in_state_gate = false;
 }
 
+bool AreMostVisitedItemsEqual(
+    const std::vector<InstantMostVisitedItem>& new_items,
+    const std::vector<InstantMostVisitedItem>& old_items) {
+  if (new_items.size() != old_items.size())
+    return false;
+
+  for (size_t i = 0; i < old_items.size(); ++i) {
+    if (old_items[i].url != new_items[i].url ||
+        old_items[i].title != new_items[i].title)
+      return false;
+  }
+  return true;
+}
+
 }  // namespace chrome