Delete BSDiff sources (flutter#9086)

BSDiff is no longer used as of flutter/engine#8663. This removes the
unused Java import and sources.

Author: cbracken

ci/licenses.sh

@@ -46,7 +46,7 @@ fi
 
 echo "Checking license count in licenses_flutter..."
 actualLicenseCount=`tail -n 1 flutter/ci/licenses_golden/licenses_flutter | tr -dc '0-9'`
-expectedLicenseCount=3 # When changing this number: Update the error message below as well describing all expected license types.
+expectedLicenseCount=2 # When changing this number: Update the error message below as well describing all expected license types.
 
 if [ "$actualLicenseCount" -ne "$expectedLicenseCount" ]
 then
@@ -57,8 +57,6 @@ then
     echo "double-check that all newly added files have a BSD-style license"
     echo "header with the following copyright:"
     echo "    Copyright 2013 The Flutter Authors. All rights reserved."
-    echo "Files in 'third_party/bsdiff' may have the following copyright instead:"
-    echo "    Copyright 2003-2005 Colin Percival. All rights reserved."
     echo "Files in 'third_party/txt' may have an Apache license header instead."
     echo "If you're absolutely sure that the change in license count is"
     echo "intentional, update 'flutter/ci/licenses.sh' with the new count."

ci/licenses_golden/licenses_flutter

@@ -4,37 +4,6 @@ UNUSED LICENSES:
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 USED LICENSES:
 
-====================================================================================================
-LIBRARY: bsdiff
-ORIGIN: ../../../flutter/third_party/bsdiff/LICENSE
-TYPE: LicenseType.bsd
-FILE: ../../../flutter/third_party/bsdiff/io/flutter/util/BSDiff.java
-----------------------------------------------------------------------------------------------------
-Copyright 2003-2005 Colin Percival. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
-
-1. Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
-2. Redistributions in binary form must reproduce the above copyright
-   notice, this list of conditions and the following disclaimer in the
-   documentation and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-====================================================================================================
-
 ====================================================================================================
 LIBRARY: engine
 LIBRARY: txt
@@ -1296,4 +1265,4 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 ====================================================================================================
-Total license count: 3
+Total license count: 2

shell/platform/android/BUILD.gn

@@ -209,8 +209,6 @@ action("flutter_shell_java") {
 
   sources += get_target_outputs(":gen_android_build_config_java")
 
-  sources += [ "$flutter_root/third_party/bsdiff/io/flutter/util/BSDiff.java" ]
-
   android_support_jars = [
     "//third_party/android_support/android_support_v13.jar",
     "//third_party/android_support/android_support_compat.jar",

shell/platform/android/io/flutter/view/ResourceExtractor.java

@@ -17,7 +17,6 @@
 import android.util.Log;
 
 import io.flutter.BuildConfig;
-import io.flutter.util.BSDiff;
 import io.flutter.util.PathUtils;
 
 import org.json.JSONObject;