Fixes for re-enabling more MSVC level 4 warnings: chrome/browser/ edition

chrome/browser/history/history_backend.cc

Index: chrome/browser/history/history_backend.cc
diff --git a/chrome/browser/history/history_backend.cc b/chrome/browser/history/history_backend.cc
index c72f8c01d969086ed87725711096763af815f977..5ca15ad96aae9f705c18f180727e5ce9372309d0 100644
--- a/chrome/browser/history/history_backend.cc
+++ b/chrome/browser/history/history_backend.cc
@@ -349,8 +349,10 @@ SegmentID HistoryBackend::UpdateSegments(
     if (!url_id)
       return 0;
 
-    if (!(segment_id = db_->GetSegmentNamed(segment_name))) {
-      if (!(segment_id = db_->CreateSegment(url_id, segment_name))) {
+    segment_id = db_->GetSegmentNamed(segment_name);
+    if (!segment_id) {
+      segment_id = db_->CreateSegment(url_id, segment_name);
+      if (!segment_id) {
         NOTREACHED();
         return 0;
       }
@@ -365,7 +367,8 @@ SegmentID HistoryBackend::UpdateSegments(
     // This can happen if the initial navigation wasn't AUTO_BOOKMARK or
     // TYPED. (For example GENERATED). In this case this visit doesn't count
     // toward any segment.
-    if (!(segment_id = GetLastSegmentID(from_visit)))
+    segment_id = GetLastSegmentID(from_visit);
+    if (!segment_id)
       return 0;
   }