Move the unit tests files side-by-side with the corresponding .cc files.

components/update_client/test_installer.h

Index: components/update_client/test_installer.h
diff --git a/components/update_client/test/test_installer.h b/components/update_client/test_installer.h
similarity index 88%
rename from components/update_client/test/test_installer.h
rename to components/update_client/test_installer.h
index e15ae0a0b4a27160c34e3a2cc02b3b5030749b79..44a6f280346ff9b1465bef080a56d6c95e45e287 100644
--- a/components/update_client/test/test_installer.h
+++ b/components/update_client/test_installer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_UPDATE_CLIENT_TEST_TEST_INSTALLER_H_
-#define COMPONENTS_UPDATE_CLIENT_TEST_TEST_INSTALLER_H_
+#ifndef COMPONENTS_UPDATE_CLIENT_TEST_INSTALLER_H_
+#define COMPONENTS_UPDATE_CLIENT_TEST_INSTALLER_H_
 
 #include <string>
 
@@ -34,13 +34,9 @@ class TestInstaller : public CrxInstaller {
 
   bool Uninstall() override;
 
-  int error() const {
-    return error_;
-  }
+  int error() const { return error_; }
 
-  int install_count() const {
-    return install_count_;
-  }
+  int install_count() const { return install_count_; }
 
  protected:
   ~TestInstaller() override;
@@ -85,4 +81,4 @@ class VersionedTestInstaller : public TestInstaller {
 
 }  // namespace update_client
 
-#endif  // COMPONENTS_UPDATE_CLIENT_TEST_TEST_INSTALLER_H_
+#endif  // COMPONENTS_UPDATE_CLIENT_TEST_INSTALLER_H_