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

chrome/installer/util/delete_reg_value_work_item_unittest.cc

Index: chrome/installer/util/delete_reg_value_work_item_unittest.cc
diff --git a/chrome/installer/util/delete_reg_value_work_item_unittest.cc b/chrome/installer/util/delete_reg_value_work_item_unittest.cc
index 9a508aec4b23e00e6eb2745134b6b141e4295448..0c1f11e7c0da546ead677b61f4c9bf9fb5548505 100644
--- a/chrome/installer/util/delete_reg_value_work_item_unittest.cc
+++ b/chrome/installer/util/delete_reg_value_work_item_unittest.cc
@@ -92,8 +92,8 @@ TEST_F(DeleteRegValueWorkItemTest, DeleteExistingValue) {
   DWORD type = 0;
   DWORD size = 0;
   EXPECT_EQ(ERROR_SUCCESS, key.ReadValue(kNameEmpty, NULL, &size, &type));
-  EXPECT_EQ(REG_SZ, type);
-  EXPECT_EQ(0, size);
+  EXPECT_EQ(static_cast<DWORD>(REG_SZ), type);
+  EXPECT_EQ(0u, size);
 }
 
 // Try deleting a value that doesn't exist.