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

chrome/installer/util/shell_util_unittest.cc

Index: chrome/installer/util/shell_util_unittest.cc
diff --git a/chrome/installer/util/shell_util_unittest.cc b/chrome/installer/util/shell_util_unittest.cc
index e581064826853c096693abb81123bc8b085fd00e..9b6308d5184ec1e6dae324ccad7026090ad2cbf9 100644
--- a/chrome/installer/util/shell_util_unittest.cc
+++ b/chrome/installer/util/shell_util_unittest.cc
@@ -1023,7 +1023,7 @@ TEST(ShellUtilTest, GetUserSpecificRegistrySuffix) {
   base::string16 suffix;
   ASSERT_TRUE(ShellUtil::GetUserSpecificRegistrySuffix(&suffix));
   ASSERT_TRUE(base::StartsWith(suffix, L".", base::CompareCase::SENSITIVE));
-  ASSERT_EQ(27, suffix.length());
+  ASSERT_EQ(27u, suffix.length());
   ASSERT_TRUE(base::ContainsOnlyChars(suffix.substr(1),
                                       L"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"));
 }
@@ -1048,7 +1048,7 @@ TEST(ShellUtilTest, ByteArrayToBase32) {
                                 L"MZXW6YTB", L"MZXW6YTBOI"};
 
   // Run the tests, with one more letter in the input every pass.
-  for (int i = 0; i < arraysize(expected); ++i) {
+  for (size_t i = 0; i < arraysize(expected); ++i) {
     ASSERT_EQ(expected[i],
               ShellUtil::ByteArrayToBase32(test_array, i));
   }