debug: use 'condition' instead of 'expression'

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -785,7 +785,7 @@ export class DebugService extends ee.EventEmitter implements debug.IDebugService
 
 
 		return this.session.setBreakpoints({ source: Source.toRawSource(modelUri, this.model), lines: breakpointsToSend.map(bp => bp.desiredLineNumber),
-			breakpoints: breakpointsToSend.map(bp => ({ line: bp.desiredLineNumber, expression: bp.condition })) }).then(response => {
+			breakpoints: breakpointsToSend.map(bp => ({ line: bp.desiredLineNumber, condition: bp.condition })) }).then(response => {
 
 			const data: {[id: string]: { line: number, verified: boolean } } = { };
 			for (let i = 0; i < breakpointsToSend.length; i++) {