Pass a std::unique_ptr<T> for ChromeBrowserMainParts::AddParts()

Chromium change:

https://chromium.googlesource.com/chromium/src/+/42e9330687356ecfaaa63e41e9ace81226fef8b7

commit 42e9330687356ecfaaa63e41e9ace81226fef8b7
Author: James Cook <jamescook@chromium.org>
Date:   Mon Jul 6 20:56:12 2020 +0000

    Make ChromeBrowserMainParts::AddParts() take a std::unique_ptr

    The function takes ownership of its argument, so change to unique_ptr
    to make that clear.

    Also remove "virtual" from the function because nothing overrides it.

    No behavior changes - I just happened to notice this while adding a
    new ExtraParts class in a different CL.

browser/brave_content_browser_client.cc

@@ -156,7 +156,7 @@ BraveContentBrowserClient::CreateBrowserMainParts(
       ChromeContentBrowserClient::CreateBrowserMainParts(parameters);
   ChromeBrowserMainParts* chrome_main_parts =
       static_cast<ChromeBrowserMainParts*>(main_parts.get());
-  chrome_main_parts->AddParts(new BraveBrowserMainExtraParts());
+  chrome_main_parts->AddParts(std::make_unique<BraveBrowserMainExtraParts>());
   return main_parts;
 }
 

chromium_src/chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.cc

@@ -31,7 +31,7 @@ class BraveBrowserMainExtraPartsProfiles
 namespace chrome {
 
 void AddProfilesExtraParts(ChromeBrowserMainParts* main_parts) {
-  main_parts->AddParts(new BraveBrowserMainExtraPartsProfiles());
+  main_parts->AddParts(std::make_unique<BraveBrowserMainExtraPartsProfiles>());
 }
 
 }  // namespace chrome