scoped_refptr: Fix assert string

Change-Id: I9e7274f3ac67f57f1d0c62eb9223f437e9b1da8b
Reviewed-on: https://chromium-review.googlesource.com/c/1340832
Commit-Queue: Chase Phillips <cmp@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609943}

base/memory/ref_counted_unittest.nc

@@ -17,7 +17,7 @@ class InitialRefCountIsZero : public base::RefCounted<InitialRefCountIsZero> {
 // TODO(hans): Remove .* and update the static_assert expectations once we roll
 // past Clang r313315. https://crbug.com/765692.
 
-#if defined(NCTEST_ADOPT_REF_TO_ZERO_START)  // [r"fatal error: static_assert failed .*\"Use AdoptRef only for the reference count starts from one\.\""]
+#if defined(NCTEST_ADOPT_REF_TO_ZERO_START)  // [r"fatal error: static_assert failed .*\"Use AdoptRef only if the reference count starts from one\.\""]
 
 void WontCompile() {
   AdoptRef(new InitialRefCountIsZero());

base/memory/scoped_refptr.h

@@ -62,7 +62,7 @@ template <typename T>
 scoped_refptr<T> AdoptRef(T* obj) {
   using Tag = std::decay_t<decltype(T::kRefCountPreference)>;
   static_assert(std::is_same<subtle::StartRefCountFromOneTag, Tag>::value,
-                "Use AdoptRef only for the reference count starts from one.");
+                "Use AdoptRef only if the reference count starts from one.");
 
   DCHECK(obj);
   DCHECK(obj->HasOneRef());