libchromeos: Move Any from Buffet to libchromeos.

Move the Any class from Buffet to libchromeos and
changed its namespace from buffet:: to chromeos::

Updated the rest of Buffet code to with the changes
to the class's namespace and header file location.

Also, now that move constructors are officially allowed by
Google C++ coding style for project with C++11 feature
support, added back the move constructor to Any as
per http://crbug.com/387902

BUG=chromium:405714,chromium:387902
TEST=USE=buffet ./build_packages

Change-Id: Id007f51b874934e4f6428fe90674495edeb79107
Reviewed-on: https://chromium-review.googlesource.com/213831
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>

buffet/commands/prop_values.h

diff --git a/buffet/commands/prop_values.h b/buffet/commands/prop_values.h
index f568dd8..106ab1d 100644
--- a/buffet/commands/prop_values.h
+++ b/buffet/commands/prop_values.h
@@ -9,9 +9,9 @@
 #include <memory>
 #include <string>
 
+#include <chromeos/any.h>
 #include <chromeos/error.h>
 
-#include "buffet/any.h"
 #include "buffet/commands/schema_utils.h"
 
 namespace base {
@@ -103,7 +103,7 @@
                         chromeos::ErrorPtr* error) = 0;
 
   // Returns the contained C++ value as Any.
-  virtual Any GetValueAsAny() const = 0;
+  virtual chromeos::Any GetValueAsAny() const = 0;
 
   // Return the type definition of this value.
   const PropType* GetPropType() const { return type_; }
@@ -149,7 +149,7 @@
   }
 
   // Helper methods to get and set the C++ representation of the value.
-  Any GetValueAsAny() const override { return value_; }
+  chromeos::Any GetValueAsAny() const override { return value_; }
   const T& GetValue() const { return value_; }
   void SetValue(T value) { value_ = std::move(value); }