Revert of [Android] Rework multidex and enable multidex for unit_tests_apk. (patchset #7 id:120001 of https://codereview.chromium.org/1581563003/ )

Reason for revert:
Broke compilation on Android

https://build.chromium.org/p/chromium/builders/Android/builds/50665

FAILED: cd ../../components; python ../build/android/gyp/apk_obfuscate.py --configuration-name Release --android-sdk /b/build/slave/Android/build/src/third_party/android_tools/sdk//platforms/android-23 --android-sdk-tools /b/build/slave/Android/build/src/third_party/android_tools/sdk//build-tools/23.0.1 --android-sdk-jar /b/build/slave/Android/build/src/third_party/android_tools/sdk//platforms/android-23/android.jar "--input-jars-paths=/b/build/slave/Android/build/src/third_party/android_tools/sdk//extras/android/support/multidex/library/libs/android-support-multidex.jar \"../out/Release/lib.java/jsr_305_javalib.jar\" \"../out/Release/lib.java/base_java.jar\" /b/build/slave/Android/build/src/third_party/android_tools/sdk//extras/android/support/annotations/android-support-annotations.jar \"../out/Release/lib.java/cronet_api.jar\" \"../out/Release/lib.java/url_java.jar\" \"../out/Release/lib.java/net_java.jar\" \"../out/Release/lib.java/cronet_java.jar\" \"../out/Release/lib.java/chromium_apk_cronet_perf_test_apk.jar\"" "--proguard-configs=cronet/android/proguard.cfg \"../out/Release/cronet_perf_test_apk/proguard.txt\"" --test-jar-path ../out/Release/test.lib.java/CronetPerfTest.jar --obfuscated-jar-path ../out/Release/cronet_perf_test_apk/obfuscated.jar --proguard-jar-path ../third_party/proguard/lib/proguard.jar --stamp ../out/Release/cronet_perf_test_apk/obfuscate.stamp --testapp --proguard-enabled
Traceback (most recent call last):
  File "../build/android/gyp/apk_obfuscate.py", line 185, in <module>
    sys.exit(main(sys.argv[1:]))
  File "../build/android/gyp/apk_obfuscate.py", line 167, in main
    DoProguard(options)
  File "../build/android/gyp/apk_obfuscate.py", line 124, in DoProguard
    proguard.CheckOutput()
  File "/b/build/slave/Android/build/src/build/android/gyp/util/proguard_util.py", line 180, in CheckOutput
    stderr_filter=stderr_filter)
  File "/b/build/slave/Android/build/src/build/android/gyp/util/build_utils.py", line 162, in CheckOutput
    raise CalledProcessError(cwd, args, stdout + stderr)
util.build_utils.CalledProcessError: Command failed: ( cd /b/build/slave/Android/build/src/components; java -jar ../third_party/proguard/lib/proguard.jar -forceprocessing -libraryjars /b/build/slave/Android/build/src/third_party/android_tools/sdk//platforms/android-23/android.jar -injars /b/build/slave/Android/build/src/third_party/android_tools/sdk//extras/android/support/multidex/library/libs/android-support-multidex.jar:../out/Release/lib.java/jsr_305_javalib.jar:../out/Release/lib.java/base_java.jar:/b/build/slave/Android/build/src/third_party/android_tools/sdk//extras/android/support/annotations/android-support-annotations.jar:../out/Release/lib.java/cronet_api.jar:../out/Release/lib.java/url_java.jar:../out/Release/lib.java/net_java.jar:../out/Release/lib.java/cronet_java.jar:../out/Release/lib.java/chromium_apk_cronet_perf_test_apk.jar -include cronet/android/proguard.cfg -include ../out/Release/cronet_perf_test_apk/proguard.txt -outjars ../out/Release/cronet_perf_test_apk/obfuscated.jar -dump ../out/Release/cronet_perf_test_apk/obfuscated.jar.dump -printseeds ../out/Release/cronet_perf_test_apk/obfuscated.jar.seeds -printusage ../out/Release/cronet_perf_test_apk/obfuscated.jar.usage -printmapping ../out/Release/cronet_perf_test_apk/obfuscated.jar.mapping )
Warning: org.chromium.base.multidex.ChromiumMultiDexInstaller: can't find referenced class org.chromium.base.multidex.ChromiumMultiDex
Warning: org.chromium.base.multidex.ChromiumMultiDexInstaller: can't find referenced class org.chromium.base.multidex.ChromiumMultiDex
Warning: there were 2 unresolved references to classes or interfaces.
         You may need to specify additional library jars (using '-libraryjars').
Error: Please correct the above warnings first.

Original issue's description:
> [Android] Rework multidex and enable multidex for unit_tests_apk.
>
> This allows multidex to be used in release builds.
>
> BUG=272790
>
> Committed: https://crrev.com/f743bef34d49987c0f1f69e2f0bb6cb8beb03bf5
> Cr-Commit-Position: refs/heads/master@{#369715}

TBR=phajdan.jr@chromium.org,agrieve@chromium.org,dpranke@chromium.org,thakis@chromium.org,yfriedman@chromium.org,jbudorick@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=272790

Review URL: https://codereview.chromium.org/1587253003

Cr-Commit-Position: refs/heads/master@{#369717}