tree bf3d24c78919949fa0dd9f7a8d92a80852c3e50a
parent 8200d40022644fcccb3701d7f86c03e45bbc7842
author Dave Borowitz <dborowitz@google.com> 1363045121 -0700
committer Dave Borowitz <dborowitz@google.com> 1363374763 -0700

Rename GitilesView's TreePath to PathPart

We originally chose "TreePath" instead of "Path" to distinguish between
the whole URL path, e.g. /repo/name/+/tree/path, from the portion of the
path referring to the tree, e.g. /tree/path. However, this portion no
longer necessarily refers to a tree, e.g. in /+refs/heads?format=TEXT.
Change the name appropriately.

Change-Id: Iefa930e60f5780bc9d9446cf3e5b13fa90e9d926