Revert [SQLite] Hack to touch page cache to debug slow connection close.

sql/connection.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sql/connection.h"
 
 #include <string.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 107 matching lines @@
   // released all statements.
   statement_cache_.clear();
   DCHECK(open_statements_.empty());
 
   // Additionally clear the prepared statements, because they contain
   // weak references to this connection.  This case has come up when
   // error-handling code is hit in production.
   ClearCache();
 
   if (db_) {
-    // TODO(shess): Some additional code to debug http://crbug.com/95527 .
-    // If you are reading this due to link errors or something, it can
-    // be safely removed.
-#if defined(HAS_SQLITE3_95527)
-    unsigned int nTouched = 0;
-    sqlite3_95527(db_, &nTouched);
-
-    // If a VERY large amount of memory was touched, crash.  This
-    // should never happen.
-    // TODO(shess): Pull this in.  It should be page_size * page_cache
-    // or something like that, 4M or 16M.  For now it's just to
-    // prevent optimization.
-    CHECK_LT(nTouched, 1000*1000*1000U);
-#endif
-
     // TODO(shess): Histogram for failure.
     sqlite3_close(db_);
     db_ = NULL;
   }
 }
 
 void Connection::Preload() {
   if (!db_) {
     DLOG(FATAL) << "Cannot preload null db";
     return;
@@ skipping 331 matching lines @@
 
 int Connection::OnSqliteError(int err, sql::Statement *stmt) {
   if (error_delegate_.get())
     return error_delegate_->OnError(err, this, stmt);
   // The default handling is to assert on debug and to ignore on release.
   DLOG(FATAL) << GetErrorMessage();
   return err;
 }
 
 }  // namespace sql