Remove code supporting incremental compilation in dart2js

pkg/compiler/lib/src/options.dart

Index: pkg/compiler/lib/src/options.dart
diff --git a/pkg/compiler/lib/src/options.dart b/pkg/compiler/lib/src/options.dart
index 59992f518bb11c388896bec2ddb57e4cd379f687..32589f34fb3cc8f5fad4bf433f11c22ce6a80bab 100644
--- a/pkg/compiler/lib/src/options.dart
+++ b/pkg/compiler/lib/src/options.dart
@@ -160,11 +160,6 @@ class CompilerOptions implements DiagnosticOptions {
   /// Whether to generate a source-map file together with the output program.
   final bool generateSourceMap;
 
-  /// Whether some values are cached for reuse in incremental compilation.
-  /// Incremental compilation allows calling `Compiler.run` more than once
-  /// (experimental).
-  final bool hasIncrementalSupport;
-
   /// URI of the main output if the compiler is generating source maps.
   final Uri outputUri;
 
@@ -280,8 +275,6 @@ class CompilerOptions implements DiagnosticOptions {
         generateCodeWithCompileTimeErrors:
             _hasOption(options, Flags.generateCodeWithCompileTimeErrors),
         generateSourceMap: !_hasOption(options, Flags.noSourceMaps),
-        hasIncrementalSupport: _forceIncrementalSupport ||
-            _hasOption(options, Flags.incrementalSupport),
         outputUri: _extractUriOption(options, '--out='),
         platformConfigUri:
             _resolvePlatformConfigFromOptions(libraryRoot, options),
@@ -343,7 +336,6 @@ class CompilerOptions implements DiagnosticOptions {
       bool enableUserAssertions: false,
       bool generateCodeWithCompileTimeErrors: false,
       bool generateSourceMap: true,
-      bool hasIncrementalSupport: false,
       Uri outputUri: null,
       Uri platformConfigUri: null,
       bool preserveComments: false,
@@ -402,7 +394,7 @@ class CompilerOptions implements DiagnosticOptions {
         suppressWarnings: suppressWarnings,
         suppressHints: suppressHints,
         shownPackageWarnings: shownPackageWarnings,
-        disableInlining: disableInlining || hasIncrementalSupport,
+        disableInlining: disableInlining,
         disableTypeInference: disableTypeInference,
         dumpInfo: dumpInfo,
         enableAssertMessage: enableAssertMessage,
@@ -413,7 +405,6 @@ class CompilerOptions implements DiagnosticOptions {
         enableUserAssertions: enableUserAssertions,
         generateCodeWithCompileTimeErrors: generateCodeWithCompileTimeErrors,
         generateSourceMap: generateSourceMap,
-        hasIncrementalSupport: hasIncrementalSupport,
         outputUri: outputUri,
         platformConfigUri: platformConfigUri ??
             _resolvePlatformConfig(libraryRoot, null, const []),
@@ -462,7 +453,6 @@ class CompilerOptions implements DiagnosticOptions {
       this.enableUserAssertions: false,
       this.generateCodeWithCompileTimeErrors: false,
       this.generateSourceMap: true,
-      this.hasIncrementalSupport: false,
       this.outputUri: null,
       this.platformConfigUri: null,
       this.preserveComments: false,
@@ -518,7 +508,6 @@ class CompilerOptions implements DiagnosticOptions {
       enableUserAssertions,
       generateCodeWithCompileTimeErrors,
       generateSourceMap,
-      hasIncrementalSupport,
       outputUri,
       platformConfigUri,
       preserveComments,
@@ -580,8 +569,6 @@ class CompilerOptions implements DiagnosticOptions {
         generateCodeWithCompileTimeErrors: generateCodeWithCompileTimeErrors ??
             options.generateCodeWithCompileTimeErrors,
         generateSourceMap: generateSourceMap ?? options.generateSourceMap,
-        hasIncrementalSupport:
-            hasIncrementalSupport ?? options.hasIncrementalSupport,
         outputUri: outputUri ?? options.outputUri,
         platformConfigUri: platformConfigUri ?? options.platformConfigUri,
         preserveComments: preserveComments ?? options.preserveComments,
@@ -706,5 +693,3 @@ const String _serverPlatform = "lib/dart_server.platform";
 const String _sharedPlatform = "lib/dart_shared.platform";
 
 const String _UNDETERMINED_BUILD_ID = "build number could not be determined";
-const bool _forceIncrementalSupport =
-    const bool.fromEnvironment('DART2JS_EXPERIMENTAL_INCREMENTAL_SUPPORT');