Fix process transfers for blob urls of sites requiring dedicated processes.

content/browser/site_instance_impl.cc

Index: content/browser/site_instance_impl.cc
diff --git a/content/browser/site_instance_impl.cc b/content/browser/site_instance_impl.cc
index 897864031ae74fa162c4d3a6e3b8a4fa2779c626..5b94f662e8d40d13cb4888deca732fd8114d3bd9 100644
--- a/content/browser/site_instance_impl.cc
+++ b/content/browser/site_instance_impl.cc
@@ -368,7 +368,8 @@ GURL SiteInstanceImpl::GetEffectiveURL(BrowserContext* browser_context,
 // static
 bool SiteInstanceImpl::DoesSiteRequireDedicatedProcess(
     BrowserContext* browser_context,
-    const GURL& effective_url) {
+    const GURL& url) {
+  GURL site_url = GetSiteForURL(browser_context, url);

[Charlie Reis, 2016/09/09 21:18:23]

nit: Let's add a comment explaining why we want the site URL here, rather than a
normal URL or an effective URL.  (Worth elaborating, since we've been bitten by
it now, and I know I'll forget.)

[ncarter (slow), 2016/09/09 21:56:32]

Done.

   // If --site-per-process is enabled, site isolation is enabled everywhere.
   if (SiteIsolationPolicy::UseDedicatedProcessesForAllSites())
     return true;
@@ -376,7 +377,7 @@ bool SiteInstanceImpl::DoesSiteRequireDedicatedProcess(
   // Let the content embedder enable site isolation for specific URLs.
   if (GetContentClient()->IsSupplementarySiteIsolationModeEnabled() &&
       GetContentClient()->browser()->DoesSiteRequireDedicatedProcess(
-          browser_context, effective_url)) {
+          browser_context, site_url)) {
     return true;
   }