Backport https://crrev.com/c/5955393 (uplift to 1.71.x) (#26197)

Uplift of #26191 (squashed) to release

patches/components-safe_browsing-core-browser-db-v4_store.cc.patch

@@ -0,0 +1,31 @@
+diff --git a/components/safe_browsing/core/browser/db/v4_store.cc b/components/safe_browsing/core/browser/db/v4_store.cc
+index 8e687f813c92e49927be6089b85b9348683ef2f2..0ce972859b2acddf72c69e14b980ec3072b0927e 100644
+--- a/components/safe_browsing/core/browser/db/v4_store.cc
++++ b/components/safe_browsing/core/browser/db/v4_store.cc
+@@ -1007,10 +1007,11 @@ bool V4Store::VerifyChecksum() {
+
+   IteratorMap iterator_map;
+   HashPrefixStr next_smallest_prefix;
+-  InitializeIteratorMap(hash_prefix_map_->view(), &iterator_map);
+-  CHECK_EQ(hash_prefix_map_->view().size(), iterator_map.size());
+-  bool has_unmerged = GetNextSmallestUnmergedPrefix(
+-      hash_prefix_map_->view(), iterator_map, &next_smallest_prefix);
++  HashPrefixMapView map_view = hash_prefix_map_->view();
++  InitializeIteratorMap(map_view, &iterator_map);
++  CHECK_EQ(map_view.size(), iterator_map.size());
++  bool has_unmerged = GetNextSmallestUnmergedPrefix(map_view, iterator_map,
++                                                    &next_smallest_prefix);
+
+   std::unique_ptr<crypto::SecureHash> checksum_ctx(
+       crypto::SecureHash::Create(crypto::SecureHash::SHA256));
+@@ -1025,8 +1026,8 @@ bool V4Store::VerifyChecksum() {
+                          next_smallest_prefix_size);
+
+     // Find the next smallest unmerged element in the map.
+-    has_unmerged = GetNextSmallestUnmergedPrefix(
+-        hash_prefix_map_->view(), iterator_map, &next_smallest_prefix);
++    has_unmerged = GetNextSmallestUnmergedPrefix(map_view, iterator_map,
++                                                 &next_smallest_prefix);
+   }
+
+   std::array<char, crypto::kSHA256Length> checksum;