Move Singleton and related structs to namespace base

Public APIs from base should live inside base:: so moved Singleton class
and structs to base{} and fixed consumers.

also fixed:

** Presubmit ERRORS **
Found Singleton<T> in the following header files.
Please move them to an appropriate source file so that the template
gets instantiated in a single compilation unit.
  chrome/browser/plugins/plugin_finder.h \
  chromecast/media/base/media_message_loop.h \
  content/browser/media/android/media_drm_credential_manager.h

Presubmit warnings:
src/chrome/browser/extensions/warning_badge_service_factory.h:5:
  #ifndef header guard has wrong style, please use:
  CHROME_BROWSER_EXTENSIONS_WARNING_BADGE_SERVICE_FACTORY_H_
  [build/header_guard] [5]
src/chrome/browser/extensions/warning_badge_service_factory.h:39:
  #endif line should be "#endif  //
  CHROME_BROWSER_EXTENSIONS_WARNING_BADGE_SERVICE_FACTORY_H_"
  [build/header_guard] [5]

TBR=jam@chromium.org

Review URL: https://codereview.chromium.org/1308823002

Cr-Commit-Position: refs/heads/master@{#348136}

2 files changed, 2 insertions, 2 deletions

diff --git a/remoting/base/service_urls.cc b/remoting/base/service_urls.cc
index bd3485c..e235958 100644
--- a/remoting/base/service_urls.cc
+++ b/remoting/base/service_urls.cc
@@ -74,7 +74,7 @@ ServiceUrls::~ServiceUrls() {
 }
 
 ServiceUrls* remoting::ServiceUrls::GetInstance() {
-  return Singleton<ServiceUrls>::get();
+  return base::Singleton<ServiceUrls>::get();
 }
 
 const std::string& ServiceUrls::directory_base_url() const {
diff --git a/remoting/base/service_urls.h b/remoting/base/service_urls.h
index 6d1b625..bafdc6a 100644
--- a/remoting/base/service_urls.h
+++ b/remoting/base/service_urls.h
@@ -37,7 +37,7 @@ class ServiceUrls {
   const std::string& gcd_jid() const;
 
  private:
-  friend struct DefaultSingletonTraits<ServiceUrls>;
+  friend struct base::DefaultSingletonTraits<ServiceUrls>;
 
   ServiceUrls();
   virtual ~ServiceUrls();