Remove container indirection in Blob.lazy

When working with wiki repositories, we end up doing
`container.project.repository` and using the main project repository,
rather than the original wiki repository.

Since `Blob.lazy` doesn't use the `container` we can just pass the
`Repository` instance directly.

app/models/blob.rb

@@ -86,8 +86,8 @@ class Blob < SimpleDelegator
     new(blob, container)
   end
 
-  def self.lazy(container, commit_id, path, blob_size_limit: Gitlab::Git::Blob::MAX_DATA_DISPLAY_SIZE)
-    BatchLoader.for([commit_id, path]).batch(key: container.repository) do |items, loader, args|
+  def self.lazy(repository, commit_id, path, blob_size_limit: Gitlab::Git::Blob::MAX_DATA_DISPLAY_SIZE)
+    BatchLoader.for([commit_id, path]).batch(key: repository) do |items, loader, args|
       args[:key].blobs_at(items, blob_size_limit: blob_size_limit).each do |blob|
         loader.call([blob.commit_id, blob.path], blob) if blob
       end

app/models/snippet.rb

@@ -204,7 +204,7 @@ class Snippet < ApplicationRecord
   def blobs
     return [] unless repository_exists?
 
-    repository.ls_files(repository.root_ref).map { |file| Blob.lazy(self, repository.root_ref, file) }
+    repository.ls_files(repository.root_ref).map { |file| Blob.lazy(repository, repository.root_ref, file) }
   end
 
   def hook_attrs

lib/gitlab/diff/file.rb

@@ -357,7 +357,7 @@ module Gitlab
       def fetch_blob(sha, path)
         return unless sha
 
-        Blob.lazy(repository.project, sha, path)
+        Blob.lazy(repository, sha, path)
       end
 
       def total_blob_lines(blob)

spec/models/blob_spec.rb

@@ -32,7 +32,7 @@ describe Blob do
       it 'does not fetch blobs when none are accessed' do
         expect(container.repository).not_to receive(:blobs_at)
 
-        described_class.lazy(container, commit_id, 'CHANGELOG')
+        described_class.lazy(container.repository, commit_id, 'CHANGELOG')
       end
 
       it 'fetches all blobs for the same repository when one is accessed' do
@@ -41,10 +41,10 @@ describe Blob do
           .once.and_call_original
         expect(other_container.repository).not_to receive(:blobs_at)
 
-        changelog = described_class.lazy(container, commit_id, 'CHANGELOG')
-        contributing = described_class.lazy(same_container, commit_id, 'CONTRIBUTING.md')
+        changelog = described_class.lazy(container.repository, commit_id, 'CHANGELOG')
+        contributing = described_class.lazy(same_container.repository, commit_id, 'CONTRIBUTING.md')
 
-        described_class.lazy(other_container, commit_id, 'CHANGELOG')
+        described_class.lazy(other_container.repository, commit_id, 'CHANGELOG')
 
         # Access property so the values are loaded
         changelog.id
@@ -52,14 +52,14 @@ describe Blob do
       end
 
       it 'does not include blobs from previous requests in later requests' do
-        changelog = described_class.lazy(container, commit_id, 'CHANGELOG')
-        contributing = described_class.lazy(same_container, commit_id, 'CONTRIBUTING.md')
+        changelog = described_class.lazy(container.repository, commit_id, 'CHANGELOG')
+        contributing = described_class.lazy(same_container.repository, commit_id, 'CONTRIBUTING.md')
 
         # Access property so the values are loaded
         changelog.id
         contributing.id
 
-        readme = described_class.lazy(container, commit_id, 'README.md')
+        readme = described_class.lazy(container.repository, commit_id, 'README.md')
 
         expect(container.repository).to receive(:blobs_at)
           .with([[commit_id, 'README.md']], blob_size_limit: blob_size_limit).once.and_call_original