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 8f0feba44b258bff1a66581ef0684647989edf73..ca8005a2b16eb43b698dda1fc763c1f3ca5826f1 100644
--- a/chrome/browser/search/search.cc
+++ b/chrome/browser/search/search.cc
@@ -729,4 +729,19 @@ void ResetInstantExtendedOptInStateGateForTest() {
   instant_extended_opt_in_state_gate = false;
 }
 
+bool AreMostVisitedItemsEqual(
+    const std::vector<InstantMostVisitedItem>& items_a,
+    const std::vector<InstantMostVisitedItem>& items_b) {
+  if (items_a.size() != items_b.size())
+    return false;
+
+  for (size_t i = 0; i < items_b.size(); ++i) {
+    if (items_b[i].url != items_a[i].url ||
+        items_b[i].title != items_a[i].title) {
+      return false;
+    }
+  }
+  return true;
+}
+
 }  // namespace chrome