Don't reuse the minidump descriptor for the crash signal pipe.

components/crash/content/app/crash_reporter_client.h

Index: components/crash/content/app/crash_reporter_client.h
diff --git a/components/crash/content/app/crash_reporter_client.h b/components/crash/content/app/crash_reporter_client.h
index 157ba53e1361493bcc4632caafa01b0052d8c4ea..db0f6ec28168e8d86060a9c36d2499d8cf39abd9 100644
--- a/components/crash/content/app/crash_reporter_client.h
+++ b/components/crash/content/app/crash_reporter_client.h
@@ -148,6 +148,10 @@ class CrashReporterClient {
   // Returns the descriptor key of the android minidump global descriptor.
   virtual int GetAndroidMinidumpDescriptor();
 
+  // Returns the file descriptor of the pipe used to inform apps of
+  // webview renderer crashes.
+  virtual int GetAndroidCrashSignalFD();
+
   // Returns true if breakpad microdumps should be enabled. This orthogonal to
   // the standard minidump uploader (which depends on the user consent).
   virtual bool ShouldEnableBreakpadMicrodumps();