Minor: remove redundant implementations of ResolutionContext#self

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/context/BasicCallResolutionContext.java

@@ -90,9 +90,4 @@ public class BasicCallResolutionContext extends CallResolutionContext<BasicCallR
         return create(trace, scope, call, expectedType, dataFlowInfo, contextDependency, checkArguments, resolutionResultsCache,
                       labelResolver, dataFlowInfoForArguments, callResolverExtension, isAnnotationContext);
     }
-
-    @Override
-    protected BasicCallResolutionContext self() {
-        return this;
-    }
 }

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/context/CallCandidateResolutionContext.java

@@ -98,9 +98,4 @@ public final class CallCandidateResolutionContext<D extends CallableDescriptor>
                 candidateCall, tracing, trace, scope, call, expectedType, dataFlowInfo, contextDependency, checkArguments,
                 resolutionResultsCache, labelResolver, dataFlowInfoForArguments, callResolverExtension, isAnnotationContext);
     }
-
-    @Override
-    protected CallCandidateResolutionContext<D> self() {
-        return this;
-    }
 }

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/context/ResolutionContext.java

@@ -68,8 +68,12 @@ public abstract class ResolutionContext<Context extends ResolutionContext<Contex
             @NotNull ResolutionResultsCache resolutionResultsCache,
             @NotNull LabelResolver labelResolver
     );
-    
-    protected abstract Context self();
+
+    @NotNull
+    private Context self() {
+        //noinspection unchecked
+        return (Context) this;
+    }
 
     @NotNull
     public Context replaceBindingTrace(@NotNull BindingTrace trace) {

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/context/SimpleResolutionContext.java

@@ -54,9 +54,4 @@ public class SimpleResolutionContext extends ResolutionContext<SimpleResolutionC
                 trace, scope, expectedType, dataFlowInfo, contextDependency, resolutionResultsCache, labelResolver, callResolverExtension,
                 isAnnotationContext);
     }
-
-    @Override
-    protected SimpleResolutionContext self() {
-        return this;
-    }
 }

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/tasks/ResolutionTask.java

@@ -119,11 +119,6 @@ public class ResolutionTask<D extends CallableDescriptor, F extends D> extends C
         return newTask;
     }
 
-    @Override
-    protected ResolutionTask<D, F> self() {
-        return this;
-    }
-
     public ResolutionTask<D, F> replaceCall(@NotNull Call newCall) {
         return new ResolutionTask<D, F>(
                 candidates, reference, tracing, trace, scope, newCall, expectedType, dataFlowInfo, contextDependency, checkArguments,

compiler/frontend/src/org/jetbrains/jet/lang/types/expressions/ExpressionTypingContext.java

@@ -111,11 +111,6 @@ public class ExpressionTypingContext extends ResolutionContext<ExpressionTypingC
                                            isAnnotationContext);
     }
 
-    @Override
-    protected ExpressionTypingContext self() {
-        return this;
-    }
-
 ///////////// LAZY ACCESSORS
 
     public CompileTimeConstantChecker getCompileTimeConstantChecker() {