vk: Fix virtual keyboard in guest mode.

When crrev/1787601 landed, it removed some code that actually had a
side effect that caused the virtual keyboard to work correctly in
guest mode. Without the code, the virtual keyboard doesn't work anymore
so we are adding this code back temporarily as it is a high priority
issue.

We need to investigate how things are meant to work (and how it managed
to work prior to the filesystems code).

TBR=benwells,rhalavati,mek

Bug: 1005083
Change-Id: I0b393aa518299f5630582deb64f88d82e02ec0e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809033Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697917}

chrome/browser/extensions/component_loader.cc

@@ -576,6 +576,13 @@ void ComponentLoader::AddDefaultComponentExtensionsWithBackgroundPages(
 
   Add(IDR_CRYPTOTOKEN_MANIFEST,
       base::FilePath(FILE_PATH_LITERAL("cryptotoken")));
+
+#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
+  // TODO(https://crbug.com/1005083): Force the off the record profile to be
+  // created to allow the virtual keyboard to work in guest mode.
+  if (!IsNormalSession())
+    ExtensionsBrowserClient::Get()->GetOffTheRecordContext(profile_);
+#endif  // BUILDFLAG(GOOGLE_CHROME_BRANDING)
 }
 
 void ComponentLoader::