[sqlite] Remove WebDatabase externs and depend on what you use.

Source/modules/webdatabase/sqlite/SQLiteFileSystemWin.cpp

Index: Source/modules/webdatabase/sqlite/SQLiteFileSystemWin.cpp
diff --git a/Source/modules/webdatabase/sqlite/SQLiteFileSystemWin.cpp b/Source/modules/webdatabase/sqlite/SQLiteFileSystemWin.cpp
index b512ece3bf76e478213c71d2cbfbf8826efe8123..b3eace49fc6f3e8449ae66064205af3260d0afdf 100644
--- a/Source/modules/webdatabase/sqlite/SQLiteFileSystemWin.cpp
+++ b/Source/modules/webdatabase/sqlite/SQLiteFileSystemWin.cpp
@@ -28,6 +28,9 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// Expose chromium_sqlite3_* functions from Chromium's patched SQLite.
+#define CHROMIUM_SQLITE_INTERNALS
+
 #include "config.h"
 #include "modules/webdatabase/sqlite/SQLiteFileSystem.h"
 
@@ -35,11 +38,6 @@
 #include <sqlite3.h>
 #include "public/platform/Platform.h"
 
-// Defined in Chromium's codebase in third_party/sqlite/src/os_win.c
-extern "C" {
-int chromium_sqlite3_initialize_win_sqlite3_file(sqlite3_file* file, HANDLE handle);
-}
-
 namespace blink {
 
 // Chromium's Windows implementation of SQLite VFS