Revert "[clang-format] Keep protobuf "package" statement on one line"

This reverts commit r356835. This patch causes a regression, see the
test below:

verifyFormat("// Detached comment\n\n"
             "// Leading comment\n"
             "syntax = \"proto2\"; // trailing comment\n\n"
             "// in foo.bar package\n"
             "package foo.bar; // foo.bar package\n");

llvm-svn: 356912
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index a3000a8..ccf5e51 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1119,10 +1119,10 @@
       return LT_ImportStatement;
     }
 
-    // In .proto files, top-level options and package statements are very
-    // similar to import statements and should not be line-wrapped.
+    // In .proto files, top-level options are very similar to import statements
+    // and should not be line-wrapped.
     if (Style.Language == FormatStyle::LK_Proto && Line.Level == 0 &&
-        CurrentToken->isOneOf(Keywords.kw_option, Keywords.kw_package)) {
+        CurrentToken->is(Keywords.kw_option)) {
       next();
       if (CurrentToken && CurrentToken->is(tok::identifier))
         return LT_ImportStatement;