Fix GCC build for target 'all'

chrome/browser/ui/test/test_browser_dialog.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_TEST_TEST_BROWSER_DIALOG_H_
 #define CHROME_BROWSER_UI_TEST_TEST_BROWSER_DIALOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 34 matching lines @@
 // ShowDialog(). In a regular test suite run, RunDialog() shows the dialog and
 // immediately closes it (after ensuring it was actually created).
 //
 // To get a list of all available dialogs, run the `BrowserDialogTest.Invoke`
 // test case without other arguments. I.e.
 //
 //   browser_tests --gtest_filter=BrowserDialogTest.Invoke
 //
 // Dialogs listed can be shown interactively using the --dialog argument. E.g.
 //
-//   browser_tests --gtest_filter=BrowserDialogTest.Invoke --interactive \
+//   browser_tests --gtest_filter=BrowserDialogTest.Invoke --interactive
 //       --dialog=FooDialogTest.InvokeDialog_name
 class TestBrowserDialog {
  protected:
   TestBrowserDialog();
 
   // Runs the dialog whose name corresponds to the current test case.
   void RunDialog();
 
   // Show the dialog corresponding to |name| and leave it open.
   virtual void ShowDialog(const std::string& name) = 0;
@@ skipping 16 matching lines @@
 using DialogBrowserTest = SupportsTestDialog<InProcessBrowserTest>;
 
 namespace internal {
 
 // When present on the command line, runs the test in an interactive mode.
 constexpr const char kInteractiveSwitch[] = "interactive";
 
 }  // namespace internal
 
 #endif  // CHROME_BROWSER_UI_TEST_TEST_BROWSER_DIALOG_H_