Fix gcc 4.9.2 signed-compare error.

test/unittests/cancelable-tasks-unittest.cc

 // Copyright 2015 the V8 project 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 "src/base/atomicops.h"
 #include "src/base/platform/platform.h"
 #include "src/cancelable-task.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 
@@ skipping 98 matching lines @@
 
 
 TEST(CancelableTask, SequentialMultipleTasks) {
   CancelableTaskManager manager;
   ResultType result1 = 0;
   ResultType result2 = 0;
   TestTask* task1 = new TestTask(&manager, &result1);
   TestTask* task2 = new TestTask(&manager, &result2);
   SequentialRunner runner1(task1);
   SequentialRunner runner2(task2);
-  EXPECT_EQ(task1->id(), 1);
-  EXPECT_EQ(task2->id(), 2);
+  EXPECT_EQ(task1->id(), 1u);
+  EXPECT_EQ(task2->id(), 2u);
 
   EXPECT_EQ(GetValue(&result1), 0);
   runner1.Run();  // Don't touch task1 after running it.
   EXPECT_EQ(GetValue(&result1), 1);
 
   EXPECT_EQ(GetValue(&result2), 0);
   runner2.Run();  // Don't touch task2 after running it.
   EXPECT_EQ(GetValue(&result2), 2);
 
   manager.CancelAndWait();
@@ skipping 43 matching lines @@
   EXPECT_EQ(GetValue(&result2), 0);
 }
 
 
 TEST(CancelableTask, RemoveBeforeCancelAndWait) {
   CancelableTaskManager manager;
   ResultType result1 = 0;
   TestTask* task1 = new TestTask(&manager, &result1, TestTask::kCheckNotRun);
   ThreadedRunner runner1(task1);
   uint32_t id = task1->id();
-  EXPECT_EQ(id, 1);
+  EXPECT_EQ(id, 1u);
   EXPECT_TRUE(manager.TryAbort(id));
   runner1.Start();
   runner1.Join();
   manager.CancelAndWait();
   EXPECT_EQ(GetValue(&result1), 0);
 }
 
 
 TEST(CancelableTask, RemoveAfterCancelAndWait) {
   CancelableTaskManager manager;
   ResultType result1 = 0;
   TestTask* task1 = new TestTask(&manager, &result1);
   ThreadedRunner runner1(task1);
   uint32_t id = task1->id();
-  EXPECT_EQ(id, 1);
+  EXPECT_EQ(id, 1u);
   runner1.Start();
   runner1.Join();
   manager.CancelAndWait();
   EXPECT_FALSE(manager.TryAbort(id));
   EXPECT_EQ(GetValue(&result1), 1);
 }
 
 
 TEST(CancelableTask, RemoveUnmanagedId) {
   CancelableTaskManager manager;
   EXPECT_FALSE(manager.TryAbort(1));
   EXPECT_FALSE(manager.TryAbort(2));
   manager.CancelAndWait();
   EXPECT_FALSE(manager.TryAbort(1));
   EXPECT_FALSE(manager.TryAbort(3));
 }
 
 }  // namespace internal
 }  // namespace v8