Fix naming issues related to LocalCaretRectBidiTest

We should use "bidi" as abbreviation of "bidirectional", but mistakenly
used "BiDi" in some senarios. This results in LocalCaretRectBiDiTest.cpp
being renamed into local_caret_rect_bi_di_test.cc in the great Blink mv.

This patch fixes the naming issues.

Change-Id: I391c1ffa7feca9fd78974669f082effb1195c043
Reviewed-on: https://chromium-review.googlesource.com/1008608
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550024}

third_party/blink/renderer/core/editing/BUILD.gn

@@ -363,7 +363,7 @@ jumbo_source_set("unit_tests") {
     "iterators/text_iterator_test.cc",
     "iterators/text_searcher_icu_test.cc",
     "layout_selection_test.cc",
-    "local_caret_rect_bi_di_test.cc",
+    "local_caret_rect_bidi_test.cc",
     "local_caret_rect_test.cc",
     "markers/active_suggestion_marker_list_impl_test.cc",
     "markers/active_suggestion_marker_test.cc",