Build third-party code with -Wall, build chromium_code with -Wextra on Linux

chrome/browser/chromeos/file_system_provider/service_unittest.cc

 // Copyright 2014 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/file_system_provider/service.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
@@ skipping 133 matching lines @@
 
   void UpdateWatcherTag(const ProvidedFileSystemInfo& file_system_info,
                         const Watcher& watcher) override {
     ASSERT_TRUE(watchers_.get());
     const Watchers::iterator it =
         watchers_->find(WatcherKey(watcher.entry_path, watcher.recursive));
     ASSERT_NE(watchers_->end(), it);
     it->second.last_tag = watcher.last_tag;
   }
 
-  ProvidedFileSystemInfo* const file_system_info() const {
+  const ProvidedFileSystemInfo* file_system_info() const {
     return file_system_info_.get();
   }
-  Watchers* const watchers() const { return watchers_.get(); }
+  const Watchers* watchers() const { return watchers_.get(); }
 
  private:
   scoped_ptr<ProvidedFileSystemInfo> file_system_info_;
   scoped_ptr<Watchers> watchers_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeRegistry);
 };
 
 // Creates a fake extension with the specified |extension_id|.
 scoped_refptr<extensions::Extension> CreateFakeExtension(
@@ skipping 378 matching lines @@
     EXPECT_EQ(1u, observer.unmounts.size());
     EXPECT_FALSE(registry_->file_system_info());
     EXPECT_FALSE(registry_->watchers());
   }
 
   service_->RemoveObserver(&observer);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos