[Pepper] Handle plugin crash on QuotaReservation

content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc

Index: content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
diff --git a/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc b/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
index 2bc00423d7128975470d13cac3101f9f09878f61..b3545ee606ee62d1c391ff0ac871ab6ffed436f9 100644
--- a/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
+++ b/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
@@ -64,6 +64,12 @@ PepperFileSystemBrowserHost::PepperFileSystemBrowserHost(BrowserPpapiHost* host,
 }
 
 PepperFileSystemBrowserHost::~PepperFileSystemBrowserHost() {

[bbudge, 2014/01/07 14:48:18]

We have a way to detect plugin crashes in the renderer, and I thought
we would have to add that capability in the browser process too. Your
approach seems good to me though.

We probably need a comment here about the plugin crash. How about:
// If |files_| is not empty, the plugin failed to close some files. It must have
crashed.

[tzik, 2014/01/08 11:59:29]

Done.

+  if (!files_.empty()) {
+    file_system_context_->default_file_task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&QuotaReservation::OnClientCrash, quota_reservation_));
+  }
+
   // All FileRefs and FileIOs that reference us must have been destroyed. Cancel
   // all pending file system operations.
   if (file_system_operation_runner_)