Recognize json media types as (non-image) mime types.

net/base/mime_util.cc

Index: net/base/mime_util.cc
diff --git a/net/base/mime_util.cc b/net/base/mime_util.cc
index 8eba45ac101ff71cf6d273ab2de00d1e386498a6..3fbf08367c956013b3dcc3b79bd583aebbdfcf41 100644
--- a/net/base/mime_util.cc
+++ b/net/base/mime_util.cc
@@ -518,7 +518,9 @@ bool MimeUtil::IsSupportedMediaMimeType(const std::string& mime_type) const {
 bool MimeUtil::IsSupportedNonImageMimeType(const std::string& mime_type) const {
   return non_image_map_.find(mime_type) != non_image_map_.end() ||
       (mime_type.compare(0, 5, "text/") == 0 &&
-       !IsUnsupportedTextMimeType(mime_type));
+       !IsUnsupportedTextMimeType(mime_type)) ||
+      (mime_type.compare(0, 12, "application/") == 0 &&
+       MatchesMimeType("application/*+json", mime_type));

[abarth-chromium, 2013/12/01 23:02:32]

Is this how we check for +xml as well?

[sof, 2013/12/02 06:28:58]

Good question; there is no generic check for "xml media types" (i.e.,
application/ subtypes), but a few of the common ones are enumerated.
application/rss+xml is listed, but not application/soap+xml, for instance.

Beyond this part..should something with a MIME type application/rss+xml render
as text, or xml?

 }
 
 bool MimeUtil::IsUnsupportedTextMimeType(const std::string& mime_type) const {