Update to Dart revision de63e4f

This contains some fixes for Fuchsia and I'd like to keep the version
of Dart used in fuchsia and flutter builds consistent. Should have no
other impactful changes for Flutter.

DEPS

@@ -27,7 +27,7 @@ vars = {
 
   # Note: When updating the Dart revision, ensure that all entries that are
   # dependencies of dart are also updated
-  'dart_revision': '1ed4c27c01de6680766593b88a531ef86883a117',
+  'dart_revision': 'de63e4fa94a1cebf86f0541ac14f25fd0bff73c0',
   'dart_boringssl_gen_revision': '1a810313a0290e1caace9da73fa3ab89995ad2c7',
   'dart_boringssl_revision': 'd519bf6be0b447fb80fbc539d4bff4479b5482a2',
   'dart_observatory_packages_revision': '26aad88f1c1915d39bbcbff3cad589e2402fdcf1',

travis/licenses.golden

@@ -12905,6 +12905,7 @@ FILE: ../../../flutter/sky/engine/wtf/text/StringBufferTest.cpp
 FILE: ../../../flutter/sky/engine/wtf/text/TextCodecReplacement.cpp
 FILE: ../../../flutter/sky/engine/wtf/text/TextCodecReplacement.h
 FILE: ../../../flutter/sky/engine/wtf/text/TextCodecReplacementTest.cpp
+FILE: ../../../flutter/sky/tools/copy.pyc
 FILE: ../../../flutter/sky/tools/roll/patches/chromium/android_build.patch
 FILE: ../../../third_party/android_platform/bionic/tools/relocation_packer/src/DEPS
 FILE: ../../../third_party/android_platform/bionic/tools/relocation_packer/src/debug.cc
@@ -18956,7 +18957,6 @@ FILE: ../../../dart/sdk/lib/html/html_common/metadata.dart
 FILE: ../../../dart/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
 FILE: ../../../dart/sdk/lib/indexed_db/dartium/indexed_db_dartium.dart
 FILE: ../../../dart/sdk/lib/internal/internal.dart
-FILE: ../../../dart/sdk/lib/internal/lists.dart
 FILE: ../../../dart/sdk/lib/io/common.dart
 FILE: ../../../dart/sdk/lib/io/crypto.dart
 FILE: ../../../dart/sdk/lib/io/directory.dart
@@ -19740,10 +19740,13 @@ FILE: ../../../dart/runtime/observatory/web/favicon.ico
 FILE: ../../../dart/runtime/observatory/web/index.html
 FILE: ../../../dart/runtime/observatory/web/third_party/trace_viewer_full.html
 FILE: ../../../dart/runtime/observatory/web/timeline.html
+FILE: ../../../dart/runtime/tools/utils.pyc
+FILE: ../../../dart/runtime/vm/libraries.json
 FILE: ../../../dart/runtime/vm/snapshot_test_in.dat
 FILE: ../../../dart/samples/build_dart/test.foo
 FILE: ../../../dart/samples/build_dart_simple/test.foo
 FILE: ../../../dart/sdk/lib/_internal/js_runtime/.packages
+FILE: ../../../dart/sdk/lib/dart_server.json
 FILE: ../../../dart/sdk/lib/html/html_common/conversions_dart2js.dart
 FILE: ../../../dart/sdk/lib/html/html_common/conversions_dartium.dart
 FILE: ../../../dart/sdk/lib/html/html_common/html_common.dart
@@ -19806,7 +19809,6 @@ FILE: ../../../dart/runtime/bin/process_fuchsia.cc
 FILE: ../../../dart/runtime/bin/process_unsupported.cc
 FILE: ../../../dart/runtime/bin/reference_counting.h
 FILE: ../../../dart/runtime/bin/root_certificates_unsupported.cc
-FILE: ../../../dart/runtime/bin/run_vm_tests_fuchsia.cc
 FILE: ../../../dart/runtime/bin/secure_socket_ios.cc
 FILE: ../../../dart/runtime/bin/secure_socket_ios.h
 FILE: ../../../dart/runtime/bin/secure_socket_macos.cc
@@ -20075,6 +20077,7 @@ ORIGIN: ../../../dart/runtime/bin/error_exit.cc + ../../../dart/LICENSE
 TYPE: LicenseType.bsd
 FILE: ../../../dart/runtime/bin/error_exit.cc
 FILE: ../../../dart/runtime/bin/error_exit.h
+FILE: ../../../dart/runtime/bin/isolate_data.cc
 FILE: ../../../dart/runtime/bin/snapshot_utils.cc
 FILE: ../../../dart/runtime/bin/snapshot_utils.h
 FILE: ../../../dart/runtime/vm/fixed_cache.h
@@ -72134,4 +72137,4 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 ====================================================================================================
 Total license count: 695
-     31566 of 31566 ██████████ 100% (0 missing licenses)  Done.    
+     31569 of 31569 ██████████ 100% (0 missing licenses)  Done.