Fix FreeBSD port.

TBR=kasperl@chromium.org
BUG=912

Review URL: http://codereview.chromium.org/4084001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5693 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/platform-freebsd.cc

@@ -617,7 +617,10 @@ class Sampler::PlatformData : public Malloced {
 
 
 Sampler::Sampler(int interval, bool profiling)
-    : interval_(interval), profiling_(profiling), active_(false) {
+    : interval_(interval),
+      profiling_(profiling),
+      synchronous_(profiling),
+      active_(false) {
   data_ = new PlatformData();
 }