Avoid wrapping long branch and tag names

Make the branch and tag column 650px wide, and give 300px to the
branch names. This should reduce line wrapping on long names.

Change-Id: I5607c50c962ab10bd236ae6baa048da6764ffb5d

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

diff --git a/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css b/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css
index 0c57519..55450ec 100644
--- a/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css
+++ b/gitiles-servlet/src/main/resources/com/google/gitiles/static/gitiles.css
@@ -102,15 +102,15 @@
   padding-bottom: 5px; /* VPADDING */
 }
 .repository-refs {
-  width: 450px;
+  width: 650px;
 }
 .repository-branches {
   float: left;
-  width: 200px;
+  width: 300px;
 }
 .repository-tags {
   float: right;
-  width: 250px;
+  width: 350px;
 }
 .clone-line {
   background-color: #e5ecf9; /* BOX_BACKGROUND */