Upgrade gitiles to 0.2-9

This release of gitiles includes an upgrade of JGit to align with
the version used in Gerrit.

Full list of changes since 0.2-8:

- Bump version to 0.2-9
- Don't render navbar.md metadata in html
- Enable more error-prone checks
- Enable error-prone checks by default
- Update bazel options to align with gerrit's
- Upgrade JGit to 5.3.1.201904271842-r
- Remove references to |blessStringAsTrustedResourceUrlForLegacy in <link href>.
- VisibilityCacheTest: Minor formatting fixes
- tools/eclipse/project.sh: Use bazel query to find project.py
- MoreAssert: Suppress warning about unchecked conversion
- Remove unused HttpServletRequest and HttpServletResponse parameters
- Remove unnecessarily nested else blocks
- DocServlet#fileTooBig: Remove unused parameter
- Add missing serialVersionUIDs
- Remove unused Logger instances
- Format Java files with google-java-format 1.7
- Update mailmap
- Throw GitilesRequestFailureException
- Introduce GitilesRequestFailureException and DefaultErrorHandlingFilter

Change-Id: I911816e283a9ee5f0e6257ceb476af552ec77e86

WORKSPACE

@@ -720,7 +720,7 @@ maven_jar(
     sha1 = "f7be08ec23c21485b9b5a1cf1654c2ec8c58168d",
 )
 
-GITILES_VERS = "0.2-8"
+GITILES_VERS = "0.2-9"
 
 GITILES_REPO = GERRIT
 
@@ -729,14 +729,14 @@ maven_jar(
     artifact = "com.google.gitiles:blame-cache:" + GITILES_VERS,
     attach_source = False,
     repository = GITILES_REPO,
-    sha1 = "714fd1d98d02cd8898532ef5169f7b23125747d6",
+    sha1 = "8248f6a8b0863990fe519e9d0de39ec5dc99c189",
 )
 
 maven_jar(
     name = "gitiles-servlet",
     artifact = "com.google.gitiles:gitiles-servlet:" + GITILES_VERS,
     repository = GITILES_REPO,
-    sha1 = "a416e4ac5a0cad04410440d0b2785fa966bc5a0c",
+    sha1 = "cb47a8f1d84645acddfe2945a63ce8ce5c22a53e",
 )
 
 # prettify must match the version used in Gitiles