Remove base::StringValue

As a follow-up to typedeffing base::StringValue to base::Value in
http://crrev.com/2516363005 this change replaces all references to
base::StringValue by base::Value.

TBR=stevenjb@chromium.org
BUG=646113

Review-Url: https://codereview.chromium.org/2664753002
Cr-Original-Commit-Position: refs/heads/master@{#454848}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 122c4da76a70443fe965d1413741a79416a6e763
1 file changed