Update SplitString calls in chrome.

chrome/browser/ui/tabs/tab_strip_model_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 
 #include <map>
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 228 matching lines @@
   void PrepareTabstripForSelectionTest(TabStripModel* model,
                                        int tab_count,
                                        int pinned_count,
                                        const std::string& selected_tabs) {
     for (int i = 0; i < tab_count; ++i)
       model->AppendWebContents(CreateWebContentsWithID(i), true);
     for (int i = 0; i < pinned_count; ++i)
       model->SetTabPinned(i, true);
 
     ui::ListSelectionModel selection_model;
-    std::vector<std::string> selection;
-    base::SplitStringAlongWhitespace(selected_tabs, &selection);
-    for (size_t i = 0; i < selection.size(); ++i) {
+    for (const base::StringPiece& sel : base::SplitStringPiece(
+             selected_tabs, base::kWhitespaceASCII,
+             base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY)) {
       int value;
-      ASSERT_TRUE(base::StringToInt(selection[i], &value));
+      ASSERT_TRUE(base::StringToInt(sel, &value));
       selection_model.AddIndexToSelection(value);
     }
     selection_model.set_active(selection_model.selected_indices()[0]);
     model->SetSelectionFromModel(selection_model);
   }
 };
 
 class MockTabStripModelObserver : public TabStripModelObserver {
  public:
   explicit MockTabStripModelObserver(TabStripModel* model)
@@ skipping 2315 matching lines @@
   WebContents* page_d_contents = CreateWebContents();
   strip.AddWebContents(page_c_contents, -1, ui::PAGE_TRANSITION_LINK,
                        TabStripModel::ADD_NONE);
   strip.AddWebContents(page_d_contents, -1, ui::PAGE_TRANSITION_LINK,
                        TabStripModel::ADD_NONE);
 
   EXPECT_EQ(2, strip.GetIndexOfWebContents(page_c_contents));
   EXPECT_EQ(3, strip.GetIndexOfWebContents(page_d_contents));
   strip.CloseAllTabs();
 }