Reduce the HistoryDatabase's page cache from 6000 (24MB) to 1000 (4MB) pages.

chrome/browser/history/history_database.cc

Index: chrome/browser/history/history_database.cc
diff --git a/chrome/browser/history/history_database.cc b/chrome/browser/history/history_database.cc
index 9be2f15bf4daca7aef5bcc68d5b569237dc23258..782bdfcdb4799e3d6cadd5aa54dd8c750cfe1ef8 100644
--- a/chrome/browser/history/history_database.cc
+++ b/chrome/browser/history/history_database.cc
@@ -56,11 +56,11 @@ sql::InitStatus HistoryDatabase::Init(const base::FilePath& history_name) {
   // this is a NOP. Must be a power of 2 and a max of 8192.
   db_.set_page_size(4096);
 
-  // Increase the cache size. The page size, plus a little extra, times this
+  // Set the cache size. The page size, plus a little extra, times this
   // value, tells us how much memory the cache will use maximum.
-  // 6000 * 4MB = 24MB
+  // 1000 * 4kB = 4MB
   // TODO(brettw) scale this value to the amount of available memory.
-  db_.set_cache_size(6000);
+  db_.set_cache_size(1000);
 
   // Note that we don't set exclusive locking here. That's done by
   // BeginExclusiveMode below which is called later (we have to be in shared