Add missing semicolon

It was missed at https://crrev.com/c/2584603

Bug: 1155269
Change-Id: I7e0ac2e75210d909cba3905b2fae1aa39dbeeb4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592997
Auto-Submit: Andrey Logvin <landrey@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837139}

base/profiler/stack_copier_signal.cc

@@ -240,7 +240,7 @@ bool StackCopierSignal::CopyStack(StackBuffer* stack_buffer,
       *timestamp = maybe_timestamp.value();
     else {
       TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cpu_profiler.debug"),
-                   "Fallback on TimeTicks::Now()")
+                   "Fallback on TimeTicks::Now()");
       *timestamp = TimeTicks::Now();
     }
   }