update_engine: fixed warnings from cpplint

Fixed all the cpplint warnings in update engine.

BUG=None
TEST=Unit tests still pass.

Change-Id: I285ae858eec8abe0b26ff203b99a42a200ceb71c
Reviewed-on: https://chromium-review.googlesource.com/204027
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/p2p_manager.h b/p2p_manager.h
index 0b393f2..25526bf 100644
--- a/p2p_manager.h
+++ b/p2p_manager.h
@@ -21,11 +21,11 @@
 
 // Interface for sharing and discovering files via p2p.
 class P2PManager {
-public:
+ public:
   // Interface used for P2PManager implementations. The sole reason
   // for this interface is unit testing.
   class Configuration {
-  public:
+   public:
     virtual ~Configuration() {}
 
     // Gets the path to the p2p dir being used, e.g. /var/cache/p2p.