update_engine: Standarize mock/fake filenames.

Mock classes implement mostly MOCK_METHOD* methods used with gmock.
Those classes should be named with the prefix "Mock" in the class
name and "mock_" in the header filename.

Fake classes implement a working version of the interface they provide,
often with extra functionality to change their behavior. Those classes
should be prefixed with "Fake" in the class name and "fake_" in the
file name.

Other minor include order fixes are included in this patch.

BUG=None
TEST=Unittest still pass.

Change-Id: I23de7cb11e25182d5855afacca47d431c97b82bb
Reviewed-on: https://chromium-review.googlesource.com/227779
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
diff --git a/certificate_checker_unittest.cc b/certificate_checker_unittest.cc
index 7ac2830..d75b543 100644
--- a/certificate_checker_unittest.cc
+++ b/certificate_checker_unittest.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "update_engine/certificate_checker.h"
+
 #include <string>
 
 #include <base/strings/string_util.h>
@@ -10,11 +12,10 @@
 #include <gtest/gtest.h>
 #include <metrics/metrics_library_mock.h>
 
-#include "update_engine/certificate_checker.h"
-#include "update_engine/certificate_checker_mock.h"
 #include "update_engine/constants.h"
 #include "update_engine/fake_system_state.h"
-#include "update_engine/prefs_mock.h"
+#include "update_engine/mock_certificate_checker.h"
+#include "update_engine/mock_prefs.h"
 
 using ::testing::DoAll;
 using ::testing::Return;
@@ -55,8 +56,8 @@
   virtual void TearDown() {}
 
   FakeSystemState fake_system_state_;
-  PrefsMock* prefs_;  // shortcut to fake_system_state_.mock_prefs()
-  OpenSSLWrapperMock openssl_wrapper_;
+  MockPrefs* prefs_;  // shortcut to fake_system_state_.mock_prefs()
+  MockOpenSSLWrapper openssl_wrapper_;
   // Parameters of our mock certificate digest.
   int depth_;
   unsigned int length_;