[Android WebView] Fix a couple of typos

Fix a couple of typos in variable names/commentary introduced in:
https://codereview.chromium.org/1315633003/

No functional effect.

BUG=156062

Review URL: https://codereview.chromium.org/1331943002

Cr-Commit-Position: refs/heads/master@{#348175}
content::WebContentsViewDelegate* AwMainDelegate::CreateViewDelegate(
    content::WebContents* web_contents) {
  return AwWebContentsViewDelegate::Create(web_contents);
}

content::WebContentsViewDelegate* AwMainDelegate::CreateViewDelegate(
    content::WebContents* web_contents) {
  return AwWebContentsViewDelegate::Create(web_contents);
}
