[CSS] fix menu alignment issue on header with image

Change-Id: I137b7b8a8e792fe137e868977588e1d0e944a3cd

gitiles-servlet/src/main/resources/com/google/gitiles/static/base.css

diff --git a/gitiles-servlet/src/main/resources/com/google/gitiles/static/base.css b/gitiles-servlet/src/main/resources/com/google/gitiles/static/base.css
index 2365a07..e2ed851 100644
--- a/gitiles-servlet/src/main/resources/com/google/gitiles/static/base.css
+++ b/gitiles-servlet/src/main/resources/com/google/gitiles/static/base.css
@@ -132,6 +132,9 @@
   display: -webkit-flex;
   display: -ms-flexbox;
   display: flex;
+  -webkit-flex: 1;
+  -ms-flex: 1;
+  flex: 1;
 }
 .Header-anchor {
   color: #666;
@@ -148,11 +151,6 @@
   background: #eee;
   padding: 15px 0;
 }
-.Header-title {
-  -webkit-flex: 1;
-  -ms-flex: 1;
-  flex: 1;
-}
 .Header-menu {
   display: -webkit-flex;
   display: -ms-flexbox;