Precache manifest should not be added to fetcher pool which is full

components/precache/core/fetcher_pool.h

Index: components/precache/core/fetcher_pool.h
diff --git a/components/precache/core/fetcher_pool.h b/components/precache/core/fetcher_pool.h
index 2be36e28f508346e8e6529c40022991e95a4c32a..3d69ed6dc3e6d9648dc7ac261b9931a2e13f4303 100644
--- a/components/precache/core/fetcher_pool.h
+++ b/components/precache/core/fetcher_pool.h
@@ -8,6 +8,7 @@
 #include <memory>
 #include <unordered_map>
 
+#include "base/gtest_prod_util.h"
 #include "base/logging.h"
 
 namespace precache {
@@ -72,6 +73,8 @@ class FetcherPool {
   }
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(PrecacheFetcherTest, FetcherPoolMaxLimitReached);
+
   const size_t max_size_;
   std::unordered_map<const T*, std::unique_ptr<T>> elements_;