Coverity: Initialize statement_cache_ in the constructor.

CID=1602
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/223026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27135 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/history/in_memory_database.cc

@@ -11,7 +11,10 @@
 
 namespace history {
 
-InMemoryDatabase::InMemoryDatabase() : URLDatabase(), db_(NULL) {
+InMemoryDatabase::InMemoryDatabase()
+    : URLDatabase(),
+      db_(NULL),
+      statement_cache_(NULL) {
 }
 
 InMemoryDatabase::~InMemoryDatabase() {