[WIP] histroy: Adjust cache size OnMemoryStateChange()

components/history/core/browser/history_backend.cc

Index: components/history/core/browser/history_backend.cc
diff --git a/components/history/core/browser/history_backend.cc b/components/history/core/browser/history_backend.cc
index 210032aa2e32b67bb2a7d242047edbda4f38e9c7..a0ffd4c131cd616ac1a5bca4182865a0ce1fad5b 100644
--- a/components/history/core/browser/history_backend.cc
+++ b/components/history/core/browser/history_backend.cc
@@ -921,8 +921,8 @@ bool HistoryBackend::IsExpiredVisitTime(const base::Time& time) {
 
 void HistoryBackend::OnMemoryStateChange(
     memory_coordinator::MemoryState state) {
-  bool trim_aggressively = state == memory_coordinator::MemoryState::SUSPENDED;
-  TrimMemory(trim_aggressively);
+  db_->AdjustCacheMemory(state);
+  // TODO(bashi): Adjust cache memory of |thumbnail_db_| as well.
 }
 
 void HistoryBackend::SetPageTitle(const GURL& url,