Remove unnecessary semicolon from a macro.

This triggers compile warnings for projects with -Wextra-semi-stmt.

BUG=1064305
TEST=bots compile
R=dcheng@chromium.org

Change-Id: Ic9ae72dc4a04f410c8768614e2f6b2558ea52e1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148250
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758785}

base/sequence_checker.h

@@ -74,7 +74,7 @@
 #define SEQUENCE_CHECKER(name) base::SequenceChecker name
 #define DCHECK_CALLED_ON_VALID_SEQUENCE(name, ...)                   \
   base::ScopedValidateSequenceChecker SEQUENCE_CHECKER_INTERNAL_UID( \
-      scoped_validate_sequence_checker_)(name, ##__VA_ARGS__);
+      scoped_validate_sequence_checker_)(name, ##__VA_ARGS__)
 #define DETACH_FROM_SEQUENCE(name) (name).DetachFromSequence()
 #else  // DCHECK_IS_ON()
 #if __OBJC__ && defined(OS_IOS) && !HAS_FEATURE(objc_cxx_static_assert)