Add DwarfSection classes.

Bug: 23762183

Test: Ran new unit tests.
Change-Id: Icca2a73c50d467718ba4ac41e1c8f541488620dd
diff --git a/libunwindstack/tests/DwarfCfaTest.cpp b/libunwindstack/tests/DwarfCfaTest.cpp
index 6cf028a..687af7d 100644
--- a/libunwindstack/tests/DwarfCfaTest.cpp
+++ b/libunwindstack/tests/DwarfCfaTest.cpp
@@ -57,8 +57,8 @@
   MemoryFake memory_;
   std::unique_ptr<DwarfMemory> dmem_;
   std::unique_ptr<DwarfCfa<TypeParam>> cfa_;
-  DwarfCIE cie_;
-  DwarfFDE fde_;
+  DwarfCie cie_;
+  DwarfFde fde_;
 };
 TYPED_TEST_CASE_P(DwarfCfaTest);