Revert "[icu] Include icu::LocaleMatcher dependencies in //third_party/icu"

This reverts commit 423b22d7305ebb6ce468f9f05ed204bee7d8d004.

Reason for revert: Instead of this ad hoc patch, I will merge upstream Chromium ICU changes, which include the required BUILD.gn changes.

Change-Id: Ie0d256a744b18614073329fb7f2da27c4dd60337
diff --git a/BUILD.gn b/BUILD.gn
index 081127a..4ff40e0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -677,24 +677,19 @@
     "source/common/icuplugimp.h",
     "source/common/loadednormalizer2impl.cpp",
     "source/common/localebuilder.cpp",
-    "source/common/localematcher.cpp",
-    "source/common/localeprioritylist.cpp",
     "source/common/localsvc.h",
     "source/common/locavailable.cpp",
     "source/common/locbased.cpp",
     "source/common/locbased.h",
     "source/common/locdispnames.cpp",
-    "source/common/locdistance.cpp",
     "source/common/locdspnm.cpp",
     "source/common/locid.cpp",
     "source/common/loclikely.cpp",
-    "source/common/loclikelysubtags.cpp",
     "source/common/locmap.cpp",
     "source/common/locmap.h",
     "source/common/locresdata.cpp",
     "source/common/locutil.cpp",
     "source/common/locutil.h",
-    "source/common/lsr.cpp",
     "source/common/messageimpl.h",
     "source/common/messagepattern.cpp",
     "source/common/msvcres.h",
@@ -963,14 +958,9 @@
     "source/common/unicode/icuplug.h",
     "source/common/unicode/idna.h",
     "source/common/unicode/localebuilder.h",
-    "source/common/unicode/localematcher.h",
-    "source/common/unicode/localeprioritylist.h",
     "source/common/unicode/localpointer.h",
-    "source/common/unicode/locdistance.h",
     "source/common/unicode/locdspnm.h",
     "source/common/unicode/locid.h",
-    "source/common/unicode/loclikelysubtags.h",
-    "source/common/unicode/lsr.h",
     "source/common/unicode/messagepattern.h",
     "source/common/unicode/normalizer2.h",
     "source/common/unicode/normlzr.h",