Re-enable various MSVC warnings.

base/allocator/allocator_unittest.cc

Index: base/allocator/allocator_unittest.cc
diff --git a/base/allocator/allocator_unittest.cc b/base/allocator/allocator_unittest.cc
index eb20b38ab6156f640d938edfe28914146ac3e15e..a39b8384452bdf8bdf7247bda4c1a88b5d8c4d58 100644
--- a/base/allocator/allocator_unittest.cc
+++ b/base/allocator/allocator_unittest.cc
@@ -287,6 +287,13 @@ static void TestCalloc(size_t n, size_t s, bool ok) {
   }
 }
 
+// MSVC C4530 complains about exception handler usage when exceptions are
+// disabled.  Temporarily disable that warning so we can test that they are, in
+// fact, disabled.
+#if defined(OS_WIN)
+#pragma warning(push)
+#pragma warning(disable: 4530)
+#endif
 
 // A global test counter for number of times the NewHandler is called.
 static int news_handled = 0;
@@ -331,6 +338,10 @@ static void TestNothrowNew(void* (*func)(size_t)) {
   std::set_new_handler(saved_handler);
 }
 
+#if defined(OS_WIN)
+#pragma warning(pop)
+#endif
+
 }  // namespace
 
 //-----------------------------------------------------------------------------