[Workspace] Remove some unused delegates

<rdar://problem/47008823> Remove some unused delegates from Workspace object

Author: aciidgh

Sources/Commands/SwiftTool.swift

@@ -90,13 +90,6 @@ private class ToolWorkspaceDelegate: WorkspaceDelegate {
         self.stdoutStream = stdoutStream as? ThreadSafeOutputByteStream ?? ThreadSafeOutputByteStream(stdoutStream)
     }
 
-    func packageGraphWillLoad(
-        currentGraph: PackageGraph,
-        dependencies: AnySequence<ManagedDependency>,
-        missingURLs: Set<String>
-    ) {
-    }
-
     func fetchingWillBegin(repository: String) {
         stdoutStream <<< "Fetching \(repository)"
         stdoutStream <<< "\n"
@@ -145,9 +138,6 @@ private class ToolWorkspaceDelegate: WorkspaceDelegate {
         stdoutStream <<< "\n"
         stdoutStream.flush()
     }
-
-    func managedDependenciesDidUpdate(_ dependencies: AnySequence<ManagedDependency>) {
-    }
 }
 
 protocol ToolName {

Sources/TestSupport/TestWorkspace.swift

@@ -499,13 +499,9 @@ public struct TestPackage {
 public final class TestWorkspaceDelegate: WorkspaceDelegate {
 
     public var events = [String]()
-    public var managedDependenciesData = [AnySequence<ManagedDependency>]()
 
     public init() {}
 
-    public func packageGraphWillLoad(currentGraph: PackageGraph, dependencies: AnySequence<ManagedDependency>, missingURLs: Set<String>) {
-    }
-
     public func repositoryWillUpdate(_ repository: String) {
         events.append("updating repo: \(repository)")
     }
@@ -537,8 +533,4 @@ public final class TestWorkspaceDelegate: WorkspaceDelegate {
     public func willResolveDependencies() {
         events.append("will resolve dependencies")
     }
-
-    public func managedDependenciesDidUpdate(_ dependencies: AnySequence<ManagedDependency>) {
-        managedDependenciesData.append(dependencies)
-    }
 }

Sources/Workspace/Workspace.swift

@@ -19,18 +19,6 @@ import Utility
 /// The delegate interface used by the workspace to report status information.
 public protocol WorkspaceDelegate: class {
 
-    // FIXME: This is defunct.
-    //
-    /// The workspace is about to load the complete package graph.
-    ///
-    /// This delegate will only be called if we actually need to fetch and resolve dependencies. 
-    ///
-    /// - Parameters:
-    ///   - currentGraph: The current package graph. This is most likely a partial package graph.
-    ///   - dependencies: The current managed dependencies in the workspace.
-    ///   - missingURLs: The top-level missing packages we need to fetch. This will never be empty.
-    func packageGraphWillLoad(currentGraph: PackageGraph, dependencies: AnySequence<ManagedDependency>, missingURLs: Set<String>)
-
     /// The workspace has started fetching this repository.
     func fetchingWillBegin(repository: String)
 
@@ -55,9 +43,6 @@ public protocol WorkspaceDelegate: class {
     /// The workspace is removing this repository because it is no longer needed.
     func removing(repository: String)
 
-    /// Called when the managed dependencies are updated.
-    func managedDependenciesDidUpdate(_ dependencies: AnySequence<ManagedDependency>)
-
     /// Called when the resolver is about to be run.
     func willResolveDependencies()
 }