Fix crash closing the Web Share target picker dialog.

chrome/browser/ui/views/webshare/webshare_target_picker_view.h

Index: chrome/browser/ui/views/webshare/webshare_target_picker_view.h
diff --git a/chrome/browser/ui/views/webshare/webshare_target_picker_view.h b/chrome/browser/ui/views/webshare/webshare_target_picker_view.h
index b3898a7f602e795f63f3d14484a984f3c469ab77..bb455fe17136d9fa1aa29a5580647650208f5cd8 100644
--- a/chrome/browser/ui/views/webshare/webshare_target_picker_view.h
+++ b/chrome/browser/ui/views/webshare/webshare_target_picker_view.h
@@ -11,13 +11,16 @@
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/browser_dialogs.h"
-#include "ui/base/models/table_model.h"
 #include "ui/base/ui_base_types.h"
-#include "ui/views/controls/table/table_view.h"
 #include "ui/views/controls/table/table_view_observer.h"
 #include "ui/views/window/dialog_delegate.h"
 
 class GURL;
+class TargetPickerTableModel;
+
+namespace views {
+class TableView;
+}
 
 // Dialog that presents the user with a list of share target apps. Allows the
 // user to pick one target to be opened and have data passed to it.
@@ -26,8 +29,7 @@ class GURL;
 // in-development feature (Web Share) behind a runtime flag. It should not be
 // used by any released code until going through UI review.
 class WebShareTargetPickerView : public views::DialogDelegateView,
-                                 public views::TableViewObserver,
-                                 public ui::TableModel {
+                                 public views::TableViewObserver {
  public:
   // |targets| is a list of app title and manifest URL pairs that will be shown
   // in a list. If the user picks a target, this calls |callback| with the
@@ -56,15 +58,11 @@ class WebShareTargetPickerView : public views::DialogDelegateView,
   void OnSelectionChanged() override;
   void OnDoubleClick() override;
 
-  // ui::TableModel overrides:
-  int RowCount() override;
-  base::string16 GetText(int row, int column_id) override;
-  void SetObserver(ui::TableModelObserver* observer) override;
-
  private:
-  views::TableView* table_;
+  views::TableView* table_ = nullptr;
 
   const std::vector<std::pair<base::string16, GURL>> targets_;
+  std::unique_ptr<TargetPickerTableModel> table_model_;
 
   base::Callback<void(base::Optional<std::string>)> close_callback_;