Revert "Make libbcc public."

This reverts commit 80232dd16c0affb2afae01cde6c94abf23ac1ba8.
diff --git a/lib/ExecutionEngine/BCCContextImpl.h b/lib/ExecutionEngine/BCCContextImpl.h
new file mode 100644
index 0000000..446eb36
--- /dev/null
+++ b/lib/ExecutionEngine/BCCContextImpl.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2012, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BCC_EXECUTION_ENGINE_CONTEXT_IMPL_H
+#define BCC_EXECUTION_ENGINE_CONTEXT_IMPL_H
+
+#include <llvm/ADT/SmallPtrSet.h>
+#include <llvm/LLVMContext.h>
+
+namespace bcc {
+
+class BCCContext;
+class Source;
+
+/*
+ * class BCCContextImpl contains the implementation of BCCCotext.
+ */
+class BCCContextImpl {
+public:
+  llvm::LLVMContext mLLVMContext;
+
+  // The set of sources that initialized in this context. They will be destroyed
+  // automatically when this context is gone.
+  llvm::SmallPtrSet<Source *, 2> mOwnSources;
+
+  BCCContextImpl(BCCContext &pContext) { }
+  ~BCCContextImpl();
+};
+
+} // namespace bcc
+
+#endif  // BCC_EXECUTION_ENGINE_CONTEXT_IMPL_H