win x86: a few trivial compile fixes when GYP_DEFINES=target_arch=ia32

snapshot/win/pe_image_reader_test.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 24 matching lines @@
       GetCurrentProcess(), self, &module_info, sizeof(module_info)));
   EXPECT_EQ(self, module_info.lpBaseOfDll);
   EXPECT_TRUE(pe_image_reader.Initialize(&process_reader,
                                          reinterpret_cast<WinVMAddress>(self),
                                          module_info.SizeOfImage,
                                          "self"));
   UUID uuid;
   DWORD age;
   std::string pdbname;
   EXPECT_TRUE(pe_image_reader.DebugDirectoryInformation(&uuid, &age, &pdbname));
-  EXPECT_NE(-1, pdbname.find("crashpad_snapshot_test"));
+  EXPECT_NE(std::string::npos, pdbname.find("crashpad_snapshot_test"));
   const std::string suffix(".pdb");
   EXPECT_EQ(
       0,
       pdbname.compare(pdbname.size() - suffix.size(), suffix.size(), suffix));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad