cros: Remove unneeded includes from update_library.h plus some random cleanups.

chrome/browser/chromeos/cros/update_library.h

Index: chrome/browser/chromeos/cros/update_library.h
diff --git a/chrome/browser/chromeos/cros/update_library.h b/chrome/browser/chromeos/cros/update_library.h
index f0fb65da303812d99cdd8932bbe2d6f2a3001950..e17934b400186b0ff8e1b55863c57b89244caa71 100644
--- a/chrome/browser/chromeos/cros/update_library.h
+++ b/chrome/browser/chromeos/cros/update_library.h
@@ -8,9 +8,6 @@
 
 #include <string>
 
-#include "base/memory/singleton.h"
-#include "base/observer_list.h"
-#include "base/time.h"
 #include "third_party/cros/chromeos_update_engine.h"
 
 namespace chromeos {
@@ -33,19 +30,19 @@ class UpdateLibrary {
           new_size(0) {
     }
 
-    explicit Status(const UpdateProgress& x) :
-        status(x.status_),
-        download_progress(x.download_progress_),
-        last_checked_time(x.last_checked_time_),
-        new_version(x.new_version_),
-        new_size(x.new_size_) {
+    explicit Status(const UpdateProgress& o)
+        : status(o.status_),
+          download_progress(o.download_progress_),
+          last_checked_time(o.last_checked_time_),
+          new_version(o.new_version_),
+          new_size(o.new_size_) {
     }
 
     UpdateStatusOperation status;
-    double download_progress;  // 0.0 - 1.0
+    double download_progress;   // 0.0 - 1.0
     int64_t last_checked_time;  // As reported by std::time().
     std::string new_version;
-    int64_t new_size;  // Valid during DOWNLOADING, in bytes.
+    int64_t new_size;           // Valid during DOWNLOADING, in bytes.
   };
 
   class Observer {