Change EXPECT/ASSERT_DCHECK_DEATH macro to not expose the |regex| parameter.

base/memory/weak_ptr_unittest.cc

Index: base/memory/weak_ptr_unittest.cc
diff --git a/base/memory/weak_ptr_unittest.cc b/base/memory/weak_ptr_unittest.cc
index e0a46a7feba8aa9ca3d6b51b524fef03d4479ef3..1a4870eab184e39f80fa2dd3d2b7abb797d61ab3 100644
--- a/base/memory/weak_ptr_unittest.cc
+++ b/base/memory/weak_ptr_unittest.cc
@@ -587,7 +587,7 @@ TEST(WeakPtrDeathTest, WeakPtrCopyDoesNotChangeThreadBinding) {
 
   // Although background thread created the copy, it can not deref the copied
   // WeakPtr.
-  ASSERT_DCHECK_DEATH(background.DeRef(arrow_copy), "");
+  ASSERT_DCHECK_DEATH(background.DeRef(arrow_copy));
 
   background.DeleteArrow(arrow_copy);
 }
@@ -609,7 +609,7 @@ TEST(WeakPtrDeathTest, NonOwnerThreadDereferencesWeakPtrAfterReference) {
   // Background thread tries to deref target, which violates thread ownership.
   BackgroundThread background;
   background.Start();
-  ASSERT_DCHECK_DEATH(background.DeRef(&arrow), "");
+  ASSERT_DCHECK_DEATH(background.DeRef(&arrow));
 }
 
 TEST(WeakPtrDeathTest, NonOwnerThreadDeletesWeakPtrAfterReference) {
@@ -629,7 +629,7 @@ TEST(WeakPtrDeathTest, NonOwnerThreadDeletesWeakPtrAfterReference) {
   background.DeRef(&arrow);
 
   // Main thread deletes Target, violating thread binding.
-  ASSERT_DCHECK_DEATH(target.reset(), "");
+  ASSERT_DCHECK_DEATH(target.reset());
 
   // |target.reset()| died so |target| still holds the object, so we
   // must pass it to the background thread to teardown.
@@ -652,7 +652,7 @@ TEST(WeakPtrDeathTest, NonOwnerThreadDeletesObjectAfterReference) {
   // Background thread tries to delete target, volating thread binding.
   BackgroundThread background;
   background.Start();
-  ASSERT_DCHECK_DEATH(background.DeleteTarget(target.release()), "");
+  ASSERT_DCHECK_DEATH(background.DeleteTarget(target.release()));
 }
 
 TEST(WeakPtrDeathTest, NonOwnerThreadReferencesObjectAfterDeletion) {
@@ -672,7 +672,7 @@ TEST(WeakPtrDeathTest, NonOwnerThreadReferencesObjectAfterDeletion) {
   background.DeleteTarget(target.release());
 
   // Main thread attempts to dereference the target, violating thread binding.
-  ASSERT_DCHECK_DEATH(arrow.target.get(), "");
+  ASSERT_DCHECK_DEATH(arrow.target.get());
 }
 
 }  // namespace base