[Chrome Apps] Move Chrome App APIs into chrome_apps namespace

As mentioned here:
https://chromium-review.googlesource.com/c/chromium/src/+/1222917/5/chrome/browser/apps/platform_apps/api/easy_unlock_private/easy_unlock_private_api.h#36

[email protected] (c/b/browser_process_impl.cc, c/test/base/, c/common/)
[email protected] (c/b/profiles/)
[email protected] (c/b/chromeos/login/)

Bug: None
Change-Id: I37d5fc0aec77e539e7decbd6de3b948e0205bda8
Reviewed-on: https://chromium-review.googlesource.com/1228949
Commit-Queue: Devlin <[email protected]>
Reviewed-by: Dominick Ng <[email protected]>
Cr-Commit-Position: refs/heads/master@{#594354}
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 584b643..ede0218 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -268,7 +268,7 @@
   extensions_browser_client_ =
       std::make_unique<extensions::ChromeExtensionsBrowserClient>();
   extensions_browser_client_->AddAPIProvider(
-      std::make_unique<apps::ChromeAppsBrowserAPIProvider>());
+      std::make_unique<chrome_apps::ChromeAppsBrowserAPIProvider>());
   extensions::ExtensionsBrowserClient::Set(extensions_browser_client_.get());
 #endif