move BuildLog to DependencyScan

The build log is needed in computing whether an edge is
dirty, so I think it belongs here.  (It's a bit weird
that Builder needs to reach into it to record completed
commands, maybe it will become cleaner with more thought.)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/state.cc b/src/state.cc
index 9f38fe9..4c7168b 100644
--- a/src/state.cc
+++ b/src/state.cc
@@ -24,7 +24,7 @@
 
 const Rule State::kPhonyRule("phony");
 
-State::State() : build_log_(NULL) {
+State::State() {
   AddRule(&kPhonyRule);
 }