Update from https://crrev.com/315085

net/disk_cache/blockfile/block_files.cc

Index: net/disk_cache/blockfile/block_files.cc
diff --git a/net/disk_cache/blockfile/block_files.cc b/net/disk_cache/blockfile/block_files.cc
index 9aa8f0f1856e81048b545058779b75acc8e33736..f46a937534993b78cbadd7326750cc48d25c4227 100644
--- a/net/disk_cache/blockfile/block_files.cc
+++ b/net/disk_cache/blockfile/block_files.cc
@@ -656,11 +656,11 @@ bool BlockFiles::FixBlockFileHeader(MappedFile* file) {
   if (file_size < file_header.Size())
     return false;  // file_size > 2GB is also an error.
 
-  const int kMinBlockSize = 36;
-  const int kMaxBlockSize = 4096;
+  const int kMinHeaderBlockSize = 36;
+  const int kMaxHeaderBlockSize = 4096;
   BlockFileHeader* header = file_header.Header();
-  if (header->entry_size < kMinBlockSize ||
-      header->entry_size > kMaxBlockSize || header->num_entries < 0)
+  if (header->entry_size < kMinHeaderBlockSize ||
+      header->entry_size > kMaxHeaderBlockSize || header->num_entries < 0)
     return false;
 
   // Make sure that we survive crashes.