Bug 1349360 - Mark experimental SourceMapService as deprecated. r=ochameau

The existing `SourceMapService` uses server-side source maps, which we are
replacing with client-side source maps.  It will be removed later in bug
1349354, but for now mark it as deprecated so we don't use it with any other
tools.

MozReview-Commit-ID: ABmWGC5asZd

devtools/client/webconsole/new-console-output/new-console-output-wrapper.js

@@ -85,7 +85,8 @@ NewConsoleOutputWrapper.prototype = {
             return panel.panelWin.NetMonitorController.inspectRequest(requestId);
           });
         },
-        sourceMapService: this.toolbox ? this.toolbox._sourceMapService : null,
+        sourceMapService:
+          this.toolbox ? this.toolbox._deprecatedServerSourceMapService : null,
         openLink: url => this.jsterm.hud.owner.openLink(url),
         createElement: nodename => {
           return this.document.createElementNS("http://www.w3.org/1999/xhtml", nodename);