Add a new GetInstance() method for singleton classes used in chrome/browser files.

chrome/browser/crash_handler_host_linux_stub.cc

Index: chrome/browser/crash_handler_host_linux_stub.cc
diff --git a/chrome/browser/crash_handler_host_linux_stub.cc b/chrome/browser/crash_handler_host_linux_stub.cc
index 6835bc27ca3302815c98e8edcaac974abb30a741..a1eb215d7a48622c594a0ab7dd2014d781c9fd5d 100644
--- a/chrome/browser/crash_handler_host_linux_stub.cc
+++ b/chrome/browser/crash_handler_host_linux_stub.cc
@@ -30,8 +30,18 @@ PluginCrashHandlerHostLinux::PluginCrashHandlerHostLinux() {
 PluginCrashHandlerHostLinux::~PluginCrashHandlerHostLinux() {
 }
 
+// static
+PluginCrashHandlerHostLinux* PluginCrashHandlerHostLinux::GetInstance() {
+  return Singleton<PluginCrashHandlerHostLinux>::get();
+}
+
 RendererCrashHandlerHostLinux::RendererCrashHandlerHostLinux() {
 }
 
 RendererCrashHandlerHostLinux::~RendererCrashHandlerHostLinux() {
 }
+
+// static
+RendererCrashHandlerHostLinux* RendererCrashHandlerHostLinux::GetInstance() {
+  return Singleton<RendererCrashHandlerHostLinux>::get();
+}