Fix Windows build after f32ca63a91d9db18cc9751dd42ca015534d24afb.

client/prune_crash_reports_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 69 matching lines @@
     ScopedFileHandle scoped_file_1k(
         LoggingOpenFileForWrite(report_1k.file_path,
                                 FileWriteMode::kCreateOrFail,
                                 FilePermissions::kOwnerOnly));
     ASSERT_TRUE(scoped_file_1k.is_valid());
 
     std::string string;
     for (int i = 0; i < 128; ++i)
       string.push_back(static_cast<char>(i));
 
-    for (int i = 0; i < 1024; i += string.size()) {
+    for (size_t i = 0; i < 1024; i += string.size()) {
       ASSERT_TRUE(LoggingWriteFile(scoped_file_1k.get(),
                                    string.c_str(), string.length()));
     }
 
     ScopedFileHandle scoped_file_3k(
         LoggingOpenFileForWrite(report_3k.file_path,
                                 FileWriteMode::kCreateOrFail,
                                 FilePermissions::kOwnerOnly));
     ASSERT_TRUE(scoped_file_3k.is_valid());
 
-    for (int i = 0; i < 3072; i += string.size()) {
+    for (size_t i = 0; i < 3072; i += string.size()) {
       ASSERT_TRUE(LoggingWriteFile(scoped_file_3k.get(),
                                    string.c_str(), string.length()));
     }
   }
 
   {
     DatabaseSizePruneCondition condition(1);
     EXPECT_FALSE(condition.ShouldPruneReport(report_1k));
     EXPECT_TRUE(condition.ShouldPruneReport(report_1k));
   }
@@ skipping 115 matching lines @@
         .WillOnce(Return(CrashReportDatabase::kNoError));
   }
 
   StaticCondition delete_all(true);
   PruneCrashReportDatabase(&db, &delete_all);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad