Remove PeerConnectionIdentityStore and related messaging/storage code.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 362de41bb5a98238d8976e0b052d7ef896c39238..4c4430538453475c87cbec2f59897373f3ce5132 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "base/files/file_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
@@ -97,6 +98,7 @@
 #include "components/update_client/update_client.h"
 #include "components/variations/service/variations_service.h"
 #include "components/web_resource/promo_resource_service.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "net/http/http_server_properties_manager.h"
 
@@ -294,6 +296,18 @@ const char kCheckDefaultBrowser[] = "browser.check_default_browser";
 const char kDesktopSearchRedirectionInfobarShownPref[] =
     "desktop_search_redirection_infobar_shown";
 
+void DeleteWebRTCIdentityStoreDBOnFileThread(base::FilePath profile_path) {
+  base::DeleteFile(profile_path.Append("WebRTCIdentityStore"), false);
+  base::DeleteFile(profile_path.Append("WebRTCIdentityStore-journal"), false);
+}
+
+void DeleteWebRTCIdentityStoreDB(Profile* profile) {
+  content::BrowserThread::PostTask(

[battre, 2016/07/01 10:43:45]

I would suggest to use PostDelayedTask with a delay of 120 seconds so that you
don't block the File thread during startup where a lot of stuff needs to be
read.

[hbos_chromium, 2016/07/01 12:15:35]

That makes sense! Done.

+      content::BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(&DeleteWebRTCIdentityStoreDBOnFileThread, profile->GetPath()));
+}
+
 }  // namespace
 
 namespace chrome {
@@ -709,6 +723,9 @@ void MigrateObsoleteProfilePrefs(Profile* profile) {
 
   // Added 5/2016.
   profile_prefs->ClearPref(kDesktopSearchRedirectionInfobarShownPref);
+
+  // Added 7/2016.
+  DeleteWebRTCIdentityStoreDB(profile);
 }
 
 }  // namespace chrome