Delete an unused variable

chrome/browser/chromeos/input_method/input_method_engine.cc

Index: chrome/browser/chromeos/input_method/input_method_engine.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_engine.cc b/chrome/browser/chromeos/input_method/input_method_engine.cc
index bf9821929e0d2c55af754f96f8ea1f437be51fd2..5afa635d7b11d31bbde22e2c94461d15bb0abebc 100644
--- a/chrome/browser/chromeos/input_method/input_method_engine.cc
+++ b/chrome/browser/chromeos/input_method/input_method_engine.cc
@@ -524,11 +524,8 @@ void InputMethodEngineImpl::OnCandidateClicked(unsigned int index,
 
 class InputMethodEngineStub : public InputMethodEngine {
  public:
-  InputMethodEngineStub()
-      : observer_(NULL), active_(false) {}
-
-  ~InputMethodEngineStub() {
-  }
+  InputMethodEngineStub() : active_(false) {}
+  ~InputMethodEngineStub() {}
 
   bool Init(InputMethodEngine::Observer* observer,
             const char* engine_name,
@@ -620,9 +617,6 @@ class InputMethodEngineStub : public InputMethodEngine {
   }
 
  private:
-  // Pointer to the object recieving events for this IME.
-  InputMethodEngine::Observer* observer_;
-
   // True when this IME is active, false if deactive.
   bool active_;