Change link from blame view to diff of that file

Change-Id: Ia0091b96e75cc4f486434c56655e5f7f9a906c74

gitiles-servlet/src/main/java/com/google/gitiles/blame/BlameServlet.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/blame/BlameServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/blame/BlameServlet.java
index 3d88ffc..a950272 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/blame/BlameServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/blame/BlameServlet.java
@@ -132,9 +132,10 @@
         }
         result.add(ImmutableMap.of(
             "abbrevSha", abbrevSha,
-            "url", GitilesView.blame().copyFrom(view)
+            "url", GitilesView.diff().copyFrom(view)
                 .setRevision(r.getSourceCommit().name())
                 .setPathPart(r.getSourcePath())
+                .setAnchor("F0")
                 .toUrl(),
             "author", CommitSoyData.toSoyData(r.getSourceAuthor(), df),
             "count", r.getCount()));