Add sharing flag to file open during unsafe image test.

base/memory/shared_memory_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 <stddef.h>
 #include <stdint.h>
 
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 571 matching lines @@
   shared_memory.Close();
 }
 
 #if defined(OS_WIN)
 TEST(SharedMemoryTest, UnsafeImageSection) {
   const char kTestSectionName[] = "UnsafeImageSection";
   wchar_t path[MAX_PATH];
   EXPECT_GT(::GetModuleFileName(nullptr, path, arraysize(path)), 0U);
 
   // Map the current executable image to save us creating a new PE file on disk.
-  base::win::ScopedHandle file_handle(
-      ::CreateFile(path, GENERIC_READ, 0, nullptr, OPEN_EXISTING, 0, nullptr));
+  base::win::ScopedHandle file_handle(::CreateFile(
+      path, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, nullptr));
   EXPECT_TRUE(file_handle.IsValid());
   base::win::ScopedHandle section_handle(
       ::CreateFileMappingA(file_handle.Get(), nullptr,
                            PAGE_READONLY | SEC_IMAGE, 0, 0, kTestSectionName));
   EXPECT_TRUE(section_handle.IsValid());
 
   // Check direct opening by name, from handle and duplicated from handle.
   SharedMemory shared_memory_open;
   EXPECT_TRUE(shared_memory_open.Open(kTestSectionName, true));
   EXPECT_FALSE(shared_memory_open.Map(1));
@@ skipping 100 matching lines @@
   memory.Close();
   SharedMemoryProcessTest::CleanUp();
 }
 
 MULTIPROCESS_TEST_MAIN(SharedMemoryTestMain) {
   return SharedMemoryProcessTest::TaskTestMain();
 }
 #endif  // !defined(OS_IOS) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
 
 }  // namespace base