Bug 1678254 - [devtools] Check descriptor type instead of current target. r=jdescottes

Differential Revision: https://phabricator.services.mozilla.com/D114856

devtools/client/framework/source-map-url-service.js

@@ -416,7 +416,7 @@ class SourceMapURLService {
     if (!this._prefValue) {
       return null;
     }
-    if (this._target.isWorkerTarget) {
+    if (this._commands.descriptorFront.isWorkerDescriptor) {
       return;
     }
 

devtools/client/fronts/descriptors/process.js

@@ -64,6 +64,10 @@ class ProcessDescriptorFront extends DescriptorMixin(
     return front;
   }
 
+  get isProcessDescriptor() {
+    return true;
+  }
+
   getCachedTarget() {
     return this._processTargetFront;
   }

devtools/client/fronts/descriptors/tab.js

@@ -104,6 +104,10 @@ class TabDescriptorFront extends DescriptorMixin(
     }
   }
 
+  get isTabDescriptor() {
+    return true;
+  }
+
   get isLocalTab() {
     return !!this._localTab;
   }

devtools/client/fronts/descriptors/webextension.js

@@ -60,6 +60,10 @@ class WebExtensionDescriptorFront extends DescriptorMixin(
     return this._form.isSystem;
   }
 
+  get isWebExtensionDescriptor() {
+    return true;
+  }
+
   get isWebExtension() {
     return this._form.isWebExtension;
   }

devtools/client/fronts/descriptors/worker.js

@@ -42,6 +42,10 @@ class WorkerDescriptorFront extends DescriptorMixin(
     return this.url.split("/").pop();
   }
 
+  get isWorkerDescriptor() {
+    return true;
+  }
+
   get isDedicatedWorker() {
     return this.type === Ci.nsIWorkerDebugger.TYPE_DEDICATED;
   }