src/vs/platform/userDataSync/common/keybindingsSync.ts/KeybindingsSynchroniser/getKeybindingsContentFromLastSyncUserData
class KeybindingsSynchroniser:	private getKeybindingsContentFromLastSyncUserData(lastSyncUserData: ILastSyncUserData): string | null {
		if (!lastSyncUserData.syncData) {
			return null;
		}

		// Return null if there is a change in platform specific property from last time sync.
		if (lastSyncUserData.platformSpecific !== undefined && lastSyncUserData.platformSpecific !== this.syncKeybindingsPerPlatform()) {
			return null;
		}

		return this.getKeybindingsContentFromSyncContent(lastSyncUserData.syncData.content);
	}