Stop using android namespace

This polutes the global namespace and causes problems when libchrome
and libbase bring ::base and ::android::base into view.

Bug: 28117776
Change-Id: I146f696b0329e79a07abd2c383cfb5bbed4717ba
Test: Compiles
diff --git a/brillo_camera/main.cpp b/brillo_camera/main.cpp
index 244c7e9..6d5a3f8 100644
--- a/brillo_camera/main.cpp
+++ b/brillo_camera/main.cpp
@@ -42,7 +42,21 @@
 #include <utils/String8.h>
 #include <utils/StrongPointer.h>
 
-using namespace android;
+using android::BnCameraDeviceCallbacks;
+using android::BufferQueue;
+using android::CameraMetadata;
+using android::CaptureRequest;
+using android::CaptureResultExtras;
+using android::CpuConsumer;
+using android::ICameraDeviceCallbacks;
+using android::ICameraDeviceUser;
+using android::ICameraService;
+using android::IGraphicBufferConsumer;
+using android::IGraphicBufferProducer;
+using android::OK;
+using android::String16;
+using android::Surface;
+using android::sp;
 
 namespace {