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/http_fetcher_unittest.cc b/http_fetcher_unittest.cc
index 91a0d10..a37becd 100644
--- a/http_fetcher_unittest.cc
+++ b/http_fetcher_unittest.cc
@@ -272,7 +272,7 @@
     // Speed up test execution.
     ret->set_idle_seconds(1);
     ret->set_retry_seconds(1);
-    mock_system_state_.get_fake_hardware()->SetIsOfficialBuild(false);
+    mock_system_state_.fake_hardware()->SetIsOfficialBuild(false);
     return ret;
   }
 
@@ -323,7 +323,7 @@
     // Speed up test execution.
     ret->set_idle_seconds(1);
     ret->set_retry_seconds(1);
-    mock_system_state_.get_fake_hardware()->SetIsOfficialBuild(false);
+    mock_system_state_.fake_hardware()->SetIsOfficialBuild(false);
     return ret;
   }
 
@@ -1051,7 +1051,7 @@
       LOG(INFO) << "added range: " << tmp_str;
     }
     dynamic_cast<MockSystemState*>(fetcher_in->GetSystemState())
-        ->get_fake_hardware()->SetIsOfficialBuild(false);
+        ->fake_hardware()->SetIsOfficialBuild(false);
     multi_fetcher->set_delegate(&delegate);
 
     StartTransferArgs start_xfer_args = {multi_fetcher, url};
@@ -1240,7 +1240,7 @@
       LOG(INFO) << "is_official_build: " << is_official_build;
       // NewLargeFetcher creates the HttpFetcher* with a MockSystemState.
       dynamic_cast<MockSystemState*>(fetcher->GetSystemState())
-          ->get_fake_hardware()->SetIsOfficialBuild(is_official_build);
+          ->fake_hardware()->SetIsOfficialBuild(is_official_build);
       fetcher->set_delegate(&delegate);
 
       StartTransferArgs start_xfer_args =