[clang-tools-extra] Remove unused forward declarations (NFC)

clang-tools-extra/clang-apply-replacements/include/clang-apply-replacements/Tooling/ApplyReplacements.h

@@ -27,7 +27,6 @@
 namespace clang {
 
 class DiagnosticsEngine;
-class Rewriter;
 
 namespace replace {
 

clang-tools-extra/clang-tidy/ClangTidyCheck.h

@@ -20,7 +20,6 @@
 
 namespace clang {
 
-class CompilerInstance;
 class SourceManager;
 
 namespace tidy {

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h

@@ -20,14 +20,7 @@
 namespace clang {
 
 class ASTContext;
-class CompilerInstance;
 class SourceManager;
-namespace ast_matchers {
-class MatchFinder;
-} // namespace ast_matchers
-namespace tooling {
-class CompilationDatabase;
-} // namespace tooling
 
 namespace tidy {
 class CachedGlobList;

clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h

@@ -12,9 +12,6 @@
 #include "../utils/RenamerClangTidyCheck.h"
 #include "llvm/ADT/Optional.h"
 namespace clang {
-
-class MacroInfo;
-
 namespace tidy {
 namespace readability {
 

clang-tools-extra/clangd/ClangdLSPServer.h

@@ -31,8 +31,6 @@
 namespace clang {
 namespace clangd {
 
-class SymbolIndex;
-
 /// This class exposes ClangdServer's capabilities via Language Server Protocol.
 ///
 /// MessageHandler binds the implemented LSP methods (e.g. onInitialize) to

clang-tools-extra/clangd/GlobalCompilationDatabase.h

@@ -24,8 +24,6 @@
 namespace clang {
 namespace clangd {
 
-class Logger;
-
 struct ProjectInfo {
   // The directory in which the compilation database was discovered.
   // Empty if directory-based compilation database discovery was not used.

clang-tools-extra/clangd/ParsedAST.h

@@ -43,7 +43,6 @@
 namespace clang {
 namespace clangd {
 class HeuristicResolver;
-class SymbolIndex;
 
 /// Stores and provides access to parsed AST.
 class ParsedAST {