don't allow to remove predefined browsers

platform/platform-impl/src/com/intellij/util/ui/table/TableModelEditor.java

@@ -39,6 +39,7 @@ import org.jetbrains.annotations.Nullable;
 import javax.swing.*;
 import javax.swing.event.TableModelEvent;
 import javax.swing.event.TableModelListener;
+import javax.swing.table.TableModel;
 import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.List;
@@ -68,7 +69,8 @@ public class TableModelEditor<T> implements ElementProducer<T> {
     }
 
     table.getEmptyText().setText(emptyText);
-    toolbarDecorator = ToolbarDecorator.createDecorator(table, this);
+    MyRemoveAction removeAction = new MyRemoveAction();
+    toolbarDecorator = ToolbarDecorator.createDecorator(table, this).setRemoveAction(removeAction).setRemoveActionUpdater(removeAction);
 
     if (itemEditor instanceof DialogItemEditor) {
       toolbarDecorator.setEditAction(new AnActionButtonRunnable() {
@@ -129,6 +131,10 @@ public class TableModelEditor<T> implements ElementProducer<T> {
      * Class must have empty constructor.
      */
     public abstract Class<T> getItemClass();
+
+    public boolean isRemovable(@NotNull T item) {
+      return true;
+    }
   }
 
   public static abstract class DialogItemEditor<T> extends ItemEditor<T> {
@@ -331,4 +337,30 @@ public class TableModelEditor<T> implements ElementProducer<T> {
   public void reset(@NotNull List<T> items) {
     model.setItems(new ArrayList<T>(items));
   }
+
+  private class MyRemoveAction implements AnActionButtonRunnable, AnActionButtonUpdater, TableUtil.ItemChecker {
+    @Override
+    public void run(AnActionButton button) {
+      if (TableUtil.doRemoveSelectedItems(table, model, this)) {
+        table.requestFocus();
+        TableUtil.updateScroller(table, false);
+      }
+    }
+
+    @Override
+    public boolean isOperationApplyable(@NotNull TableModel ignored, int row) {
+      T item = model.getItem(row);
+      return item != null && itemEditor.isRemovable(item);
+    }
+
+    @Override
+    public boolean isEnabled(AnActionEvent e) {
+      for (T item : table.getSelectedObjects()) {
+        if (itemEditor.isRemovable(item)) {
+          return true;
+        }
+      }
+      return false;
+    }
+  }
 }

xml/impl/src/com/intellij/ide/browsers/BrowserSettingsPanel.java

@@ -265,6 +265,11 @@ public class BrowserSettingsPanel {
       public void applyEdited(@NotNull ConfigurableWebBrowser oldItem, @NotNull ConfigurableWebBrowser newItem) {
         oldItem.setSpecificSettings(newItem.getSpecificSettings());
       }
+
+      @Override
+      public boolean isRemovable(@NotNull ConfigurableWebBrowser item) {
+        return !WebBrowserManager.isPredefinedBrowser(item);
+      }
     };
     browsersEditor = new TableModelEditor<ConfigurableWebBrowser>(Collections.<ConfigurableWebBrowser>emptyList(), COLUMNS,
                                                                   itemEditor, "No web browsers configured"

xml/impl/src/com/intellij/ide/browsers/WebBrowserManager.java

@@ -64,6 +64,15 @@ public class WebBrowserManager implements PersistentStateComponent<Element>, Mod
     return ServiceManager.getService(WebBrowserManager.class);
   }
 
+  static boolean isPredefinedBrowser(@NotNull ConfigurableWebBrowser browser) {
+    UUID id = browser.getId();
+    return id.equals(DEFAULT_CHROME_ID) ||
+           id.equals(DEFAULT_FIREFOX_ID) ||
+           id.equals(DEFAULT_SAFARI_ID) ||
+           id.equals(DEFAULT_OPERA_ID) ||
+           id.equals(DEFAULT_EXPLORER_ID);
+  }
+
   public enum DefaultBrowser {
     SYSTEM, FIRST, ALTERNATIVE
   }