avoid 'may be used uninitialized' warnings in stack_sampling_profiler_unittest.cc

base/profiler/stack_sampling_profiler_unittest.cc

 // Copyright 2015 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 <cstdlib>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 254 matching lines @@
     ASSERT_TRUE(PathService::Get(DIR_EXE, &other_library_path));
     other_library_path = other_library_path.Append(FilePath::FromUTF16Unsafe(
         GetNativeLibraryName(ASCIIToUTF16(
             "base_profiler_test_support_library"))));
     NativeLibraryLoadError load_error;
     *library = LoadNativeLibrary(other_library_path, &load_error);
     ASSERT_TRUE(*library) << "error loading " << other_library_path.value()
                           << ": " << load_error.ToString();
   };
 
-  NativeLibrary library;
+  NativeLibrary library = nullptr;
   load(&library);
   return library;
 }
 
 // Unloads |library| and returns when it has completed unloading. Unloading a
 // library is asynchronous on Windows, so simply calling UnloadNativeLibrary()
 // is insufficient to ensure it's been unloaded.
 void SynchronousUnloadNativeLibrary(NativeLibrary library) {
   UnloadNativeLibrary(library);
 #if defined(OS_WIN)
@@ skipping 668 matching lines @@
 #if defined(STACK_SAMPLING_PROFILER_SUPPORTED)
 #define MAYBE_UnloadedLibrary UnloadedLibrary
 #else
 #define MAYBE_UnloadedLibrary DISABLED_UnloadedLibrary
 #endif
 TEST(StackSamplingProfilerTest, MAYBE_UnloadedLibrary) {
   TestLibraryUnload(true);
 }
 
 }  // namespace base