Change uses of base::JoinString to pass StringPieces where possible.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // Copyright (c) 2013 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/chromeos/accessibility/accessibility_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 11 matching lines @@
 #include "ash/shell.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/path_service.h"
+#include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/accessibility/accessibility_extension_api.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_extension_loader.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_highlight_manager.h"
 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
@@ skipping 942 matching lines @@
 void AccessibilityManager::ReceiveBrailleDisplayState(
     std::unique_ptr<extensions::api::braille_display_private::DisplayState>
         state) {
   OnBrailleDisplayStateChanged(*state);
 }
 
 void AccessibilityManager::UpdateBrailleImeState() {
   if (!profile_)
     return;
   PrefService* pref_service = profile_->GetPrefs();
-  std::vector<std::string> preload_engines =
-      base::SplitString(pref_service->GetString(prefs::kLanguagePreloadEngines),
-                        ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
-  std::vector<std::string>::iterator it =
-      std::find(preload_engines.begin(),
-                preload_engines.end(),
+  std::string preload_engines_str =
+      pref_service->GetString(prefs::kLanguagePreloadEngines);
+  std::vector<base::StringPiece> preload_engines = base::SplitStringPiece(
+      preload_engines_str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+  std::vector<base::StringPiece>::iterator it =
+      std::find(preload_engines.begin(), preload_engines.end(),
                 extension_misc::kBrailleImeEngineId);
   bool is_enabled = (it != preload_engines.end());
   bool should_be_enabled =
       (spoken_feedback_enabled_ && braille_display_connected_);
   if (is_enabled == should_be_enabled)
     return;
   if (should_be_enabled)
     preload_engines.push_back(extension_misc::kBrailleImeEngineId);
   else
     preload_engines.erase(it);
@@ skipping 388 matching lines @@
     content::BrowserContext* context) {
   keyboard_listener_extension_id_ = id;
 
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(context);
   if (!extension_registry_observer_.IsObserving(registry) && !id.empty())
     extension_registry_observer_.Add(registry);
 }
 
 }  // namespace chromeos