Upgrade gitiles-servlet and blame-cache to 0.3-7
Upgrade gitiles-servlet and blame-cache to 0.3-7

Includes the following changes:

2e5f39b - Bump version to 0.3-7
2ab0f9f - Bump bazel version to 1.2.0
219a919 - Format Java files with google-java-format
e5a8b41 - Correct license for VisibilityChecker
c16518b - Correct license header for VisibilityCacheTest
9ca395d - VisibilityChecker: Remove topoSort argument
f0b1806 - VisibilityCache: Use jgit's ReachabilityChecker
284a35a - Accept first-parent parameter in LogServlet
11af49e - Upgrade JGit to 5.5.1.201910021850-r
beb12ac - Check BLOB content size before trying to render it

Notably this includes beb12ac which is the fix for [1], which
is a JVM crash when a large XML document is rendered.

[1] https://github.com/google/gitiles/issues/192

Change-Id: If837e84500d00b05659c1bbbbe39ce9c5879a4d8

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