Fix loop early exit bug in blockfile cache Trim behavior.

net/disk_cache/blockfile/eviction.cc

Index: net/disk_cache/blockfile/eviction.cc
diff --git a/net/disk_cache/blockfile/eviction.cc b/net/disk_cache/blockfile/eviction.cc
index 68f65b4bdcbe434b7fffeb13f0d3376727003225..97d8f703180939036d9d1c67b95c5bf3ba9a69e7 100644
--- a/net/disk_cache/blockfile/eviction.cc
+++ b/net/disk_cache/blockfile/eviction.cc
@@ -329,8 +329,8 @@ void Eviction::TrimCacheV2(bool empty) {
   int list = Rankings::LAST_ELEMENT;
 
   // Get a node from each list.
+  bool done = false;
   for (int i = 0; i < kListsToSearch; i++) {
-    bool done = false;
     next[i].set_rankings(rankings_);
     if (done)
       continue;