ThumbnailMigration  364 chrome/browser/history/history_types.cc ThumbnailMigration::ThumbnailMigration() {}
ThumbnailMigration  366 chrome/browser/history/history_types.cc ThumbnailMigration::~ThumbnailMigration() {}
ThumbnailMigration  629 chrome/browser/history/history_types.h   ThumbnailMigration();
ThumbnailMigration  630 chrome/browser/history/history_types.h   ~ThumbnailMigration();