clang/win: Let some chromium_code targets build with -Wextra.

sandbox/win/src/policy_target_test.cc

Index: sandbox/win/src/policy_target_test.cc
diff --git a/sandbox/win/src/policy_target_test.cc b/sandbox/win/src/policy_target_test.cc
index bb1f0b2ba38fd2fb94c780c26715a42c74975e2d..6e5bf156316e591a528223f727af2a718ca4c8f0 100644
--- a/sandbox/win/src/policy_target_test.cc
+++ b/sandbox/win/src/policy_target_test.cc
@@ -256,9 +256,10 @@ TEST(PolicyTargetTest, DesktopPolicy) {
   if (result == SBOX_ALL_OK)
     target.Set(temp_process_info);
 
-  EXPECT_EQ(1, ::ResumeThread(target.thread_handle()));
+  EXPECT_EQ(1u, ::ResumeThread(target.thread_handle()));
 
-  EXPECT_EQ(WAIT_TIMEOUT, ::WaitForSingleObject(target.process_handle(), 2000));
+  EXPECT_EQ(static_cast<DWORD>(WAIT_TIMEOUT),
+            ::WaitForSingleObject(target.process_handle(), 2000));
 
   EXPECT_NE(::GetThreadDesktop(target.thread_id()),
             ::GetThreadDesktop(::GetCurrentThreadId()));
@@ -319,9 +320,10 @@ TEST(PolicyTargetTest, WinstaPolicy) {
   if (result == SBOX_ALL_OK)
     target.Set(temp_process_info);
 
-  EXPECT_EQ(1, ::ResumeThread(target.thread_handle()));
+  EXPECT_EQ(1u, ::ResumeThread(target.thread_handle()));
 
-  EXPECT_EQ(WAIT_TIMEOUT, ::WaitForSingleObject(target.process_handle(), 2000));
+  EXPECT_EQ(static_cast<DWORD>(WAIT_TIMEOUT),
+            ::WaitForSingleObject(target.process_handle(), 2000));
 
   EXPECT_NE(::GetThreadDesktop(target.thread_id()),
             ::GetThreadDesktop(::GetCurrentThreadId()));
@@ -399,9 +401,9 @@ TEST(PolicyTargetTest, ShareHandleTest) {
   if (result == SBOX_ALL_OK)
     target.Set(temp_process_info);
 
-  EXPECT_EQ(1, ::ResumeThread(target.thread_handle()));
+  EXPECT_EQ(1u, ::ResumeThread(target.thread_handle()));
 
-  EXPECT_EQ(WAIT_TIMEOUT,
+  EXPECT_EQ(static_cast<DWORD>(WAIT_TIMEOUT),
             ::WaitForSingleObject(target.process_handle(), 2000));
 
   EXPECT_TRUE(::TerminateProcess(target.process_handle(), 0));