Turn OmahaRequestPrepAction into OmahaRequestDeviceParams.

Pass the params to OmahaRequestAction's ctor. This simplifies a bit
executing as well as testing of OmahaRequestAction and testing of
OmahaRequestDeviceParams. It also allows us to initialize the params
once per update attempt and use them for all OmahaRequestActions.

BUG=560
TEST=unit tests, gmerged on device and forced an update through dev server,
inspected logs.

Review URL: http://codereview.chromium.org/2836053
diff --git a/update_attempter.h b/update_attempter.h
index 9d69403..753b409 100644
--- a/update_attempter.h
+++ b/update_attempter.h
@@ -12,6 +12,7 @@
 #include <glib.h>
 #include "update_engine/action_processor.h"
 #include "update_engine/download_action.h"
+#include "update_engine/omaha_request_params.h"
 #include "update_engine/omaha_response_handler_action.h"
 
 struct UpdateEngineService;
@@ -35,8 +36,7 @@
 class UpdateAttempter : public ActionProcessorDelegate,
                         public DownloadActionDelegate {
  public:
-  UpdateAttempter() : full_update_(false),
-                      dbus_service_(NULL),
+  UpdateAttempter() : dbus_service_(NULL),
                       status_(UPDATE_STATUS_IDLE),
                       download_progress_(0.0),
                       last_checked_time_(0),
@@ -47,22 +47,22 @@
     if (utils::FileExists(kUpdateCompletedMarker))
       status_ = UPDATE_STATUS_UPDATED_NEED_REBOOT;
   }
-  void Update(bool force_full_update);
-  
+  void Update();
+
   // ActionProcessorDelegate methods:
   void ProcessingDone(const ActionProcessor* processor, bool success);
   void ProcessingStopped(const ActionProcessor* processor);
   void ActionCompleted(ActionProcessor* processor,
                        AbstractAction* action,
                        bool success);
-  
+
   // Stop updating. An attempt will be made to record status to the disk
   // so that updates can be resumed later.
   void Terminate();
-  
+
   // Try to resume from a previously Terminate()d update.
   void ResumeUpdating();
-  
+
   // Returns the current status in the out params. Returns true on success.
   bool GetStatus(int64_t* last_checked_time,
                  double* progress,
@@ -83,13 +83,12 @@
   // Sets the status to the given status and notifies a status update
   // over dbus.
   void SetStatusAndNotify(UpdateStatus status);
-  
+
   struct timespec last_notify_time_;
 
-  bool full_update_;
   std::vector<std::tr1::shared_ptr<AbstractAction> > actions_;
   ActionProcessor processor_;
-  
+
   // If non-null, this UpdateAttempter will send status updates over this
   // dbus service.
   UpdateEngineService* dbus_service_;
@@ -104,6 +103,9 @@
   std::string new_version_;
   int64_t new_size_;
 
+  // Device paramaters common to all Omaha requests.
+  OmahaRequestDeviceParams omaha_request_params_;
+
   DISALLOW_COPY_AND_ASSIGN(UpdateAttempter);
 };