FBTF: Move virtual methods to implementation files.

chrome/browser/device_orientation/provider.cc

Index: chrome/browser/device_orientation/provider.cc
diff --git a/chrome/browser/device_orientation/provider.cc b/chrome/browser/device_orientation/provider.cc
index 1ac02205a0b28b80e84741c59dbda9a7d8196567..40919372be3bfc4c176a7072fdce43c16ecd7f88 100644
--- a/chrome/browser/device_orientation/provider.cc
+++ b/chrome/browser/device_orientation/provider.cc
@@ -40,6 +40,14 @@ Provider* Provider::GetInstanceForTests() {
   return instance_;
 }
 
+Provider::Provider() {
+}
+
+Provider::~Provider() {
+  DCHECK(instance_ == this);
+  instance_ = NULL;
+}
+
 Provider* Provider::instance_ = NULL;
 
 } //  namespace device_orientation