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

chrome/browser/crash_handler_host_linux.cc

Index: chrome/browser/crash_handler_host_linux.cc
diff --git a/chrome/browser/crash_handler_host_linux.cc b/chrome/browser/crash_handler_host_linux.cc
index 5474a47c688cdfe4b9c4c686a8ded8cb1236798c..19cc514ca64c873baabfb2f88f6d787ec57493e9 100644
--- a/chrome/browser/crash_handler_host_linux.cc
+++ b/chrome/browser/crash_handler_host_linux.cc
@@ -364,6 +364,11 @@ void PluginCrashHandlerHostLinux::SetProcessType() {
   process_type_ = "plugin";
 }
 
+// static
+PluginCrashHandlerHostLinux* PluginCrashHandlerHostLinux::GetInstance() {
+  return Singleton<PluginCrashHandlerHostLinux>::get();
+}
+
 RendererCrashHandlerHostLinux::RendererCrashHandlerHostLinux() {
   InitCrashUploaderThread();
 }
@@ -374,3 +379,8 @@ RendererCrashHandlerHostLinux::~RendererCrashHandlerHostLinux() {
 void RendererCrashHandlerHostLinux::SetProcessType() {
   process_type_ = "renderer";
 }
+
+// static
+RendererCrashHandlerHostLinux* RendererCrashHandlerHostLinux::GetInstance() {
+  return Singleton<RendererCrashHandlerHostLinux>::get();
+}