Revise the SystemState hierarchy.

* Removed all #includes from SystemState; added includes in .cc files
  that use the various objects (MetricsLibrary, DevicePolicy, etc).

* MockSystemState:

  - Regulated the set of getters/setters: foo() returns the current Foo
    object interface; this object can be overridden by set_foo();
    mock_foo() or fake_foo() returns the default (internal) mock/fake
    equivalent, and fails if it is different from foo() (safety).

  - Make member declaration order consistent with that of API.

  - Removed MOCK_METHOD declarations for two methods and replaced them
    with fake getter/setter. This means that MockSystemState is now
    reduced to a fake, and can be renamed (separate CL). This also means
    that a few tests have a slightly different semantics now.

* All virtual overrides are qualified as such. However, removed the
  'const' method qualified from all getters: it made little sense,
  especially when considering that getters are handing addresses of
  internal mock members.

* Made the UpdateAttempter a contained member of both
  {Real,Mock}SystemState, resolving initialization dependencies. In
  general, the invariant is that all members of the SystemState that
  rely on it being fully populated by the time of their initialization,
  need to export a separate Init() method, that will be called (by the
  SystemState implementation constructor or Init() method) only after
  all members are set.

* Made the mock GPIO handler and connection manager contained members of
  MockSystemState; the destructor could safely be moved.

* Cleanup in UpdateAttempter (part of resolving dependencies):

  - Ordinary member initialization done via default initializers
    (constants) or initializer list in the constructor (parameters).

  - Init() method only does work that cannot be done during
    construction, with appropriate comment documenting the need for it.

  - Better reuse via constructor delegation.

BUG=chromium:358278
TEST=Unit tests.

Change-Id: I96ff6fc7e7400b0a9feb6cc8d4ffe97a51000f91
Reviewed-on: https://chromium-review.googlesource.com/193587
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Commit-Queue: David Zeuthen <zeuthen@chromium.org>
diff --git a/update_check_scheduler_unittest.cc b/update_check_scheduler_unittest.cc
index 0eed080..d4a5a1e 100644
--- a/update_check_scheduler_unittest.cc
+++ b/update_check_scheduler_unittest.cc
@@ -171,7 +171,7 @@
 
 TEST_F(UpdateCheckSchedulerTest, RunBootDeviceRemovableTest) {
   scheduler_.enabled_ = true;
-  mock_system_state_.get_fake_hardware()->SetIsOfficialBuild(true);
+  mock_system_state_.fake_hardware()->SetIsOfficialBuild(true);
   EXPECT_CALL(scheduler_, IsBootDeviceRemovable())
       .Times(1)
       .WillOnce(Return(true));
@@ -182,7 +182,7 @@
 
 TEST_F(UpdateCheckSchedulerTest, RunNonOfficialBuildTest) {
   scheduler_.enabled_ = true;
-  mock_system_state_.get_fake_hardware()->SetIsOfficialBuild(false);
+  mock_system_state_.fake_hardware()->SetIsOfficialBuild(false);
   scheduler_.Run();
   EXPECT_FALSE(scheduler_.enabled_);
   EXPECT_EQ(NULL, attempter_.update_check_scheduler());
@@ -194,7 +194,7 @@
             UpdateCheckScheduler::kTimeoutRegularFuzz,
             &interval_min,
             &interval_max);
-  mock_system_state_.get_fake_hardware()->SetIsOfficialBuild(true);
+  mock_system_state_.fake_hardware()->SetIsOfficialBuild(true);
   EXPECT_CALL(scheduler_, IsBootDeviceRemovable())
       .Times(1)
       .WillOnce(Return(false));
@@ -281,7 +281,7 @@
 TEST_F(UpdateCheckSchedulerTest, StaticCheckOOBECompleteTest) {
   scheduler_.scheduled_ = true;
   EXPECT_TRUE(scheduler_.mock_system_state_ != NULL);
-  scheduler_.mock_system_state_->get_fake_hardware()->SetIsOOBEComplete(
+  scheduler_.mock_system_state_->fake_hardware()->SetIsOOBEComplete(
       Time::UnixEpoch());
   EXPECT_CALL(attempter_, Update("", "", false, false, false))
       .Times(1)
@@ -293,7 +293,7 @@
 
 TEST_F(UpdateCheckSchedulerTest, StaticCheckOOBENotCompleteTest) {
   scheduler_.scheduled_ = true;
-  scheduler_.mock_system_state_->get_fake_hardware()->UnsetIsOOBEComplete();
+  scheduler_.mock_system_state_->fake_hardware()->UnsetIsOOBEComplete();
   EXPECT_CALL(attempter_, Update("", "", _, _, _)).Times(0);
   int interval_min, interval_max;
   FuzzRange(UpdateCheckScheduler::kTimeoutInitialInterval,