Reland "Remove unnecessary min_sdk_version from //chrome"

This reverts commit 676c68c3.

Reason for reland: Updated mismatched manifest.

Original change's description:
> Revert "Remove unnecessary min_sdk_version from //chrome"
>
> This reverts commit 3166ebf7.
>
> Reason for revert: Causing compile failure
> https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8871331944681332016/+/steps/compile/0/stdout
>
> Original change's description:
> > Remove unnecessary min_sdk_version from //chrome
> >
> > Having these causes apks to disable dex merging, making builds a bit
> > slower.
> >
> > Bug: None
> > Change-Id: I33903834529b5c2e1fec43cb81c3d076ca899055
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367648
> > Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
> > Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#800658}
>
> TBR=agrieve@chromium.org,pkotwicz@chromium.org
>
> Change-Id: Iaa31715b3e3421a10a87ce0d7699ecd8f5d5dc71
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: None
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368316
> Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
> Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800665}

Bug: None
Change-Id: I230521db24b5942374392747dc8ae872067153e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369436
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801206}

chrome/android/webapk/libs/runtime_library/javatests/apk_with_webapk_service/BUILD.gn

@@ -11,10 +11,6 @@ android_apk("apk_with_webapk_service") {
   # Used as an additional_apk in test scripts.
   never_incremental = true
 
-  # Multidex requires a custom Application class to initialize it. Simpler to
-  # just disable it.
-  enable_multidex = false
-
   android_manifest = "AndroidManifest.xml"
   apk_name = "ApkWithWebApkService"
   sources = [ "src/org/chromium/webapk/lib/runtime_library/test/TestWebApkServiceImplWrapper.java" ]
@@ -22,5 +18,4 @@ android_apk("apk_with_webapk_service") {
     "//chrome/android/webapk/libs/runtime_library:runtime_library_for_tests_java",
     "//chrome/android/webapk/libs/runtime_library:webapk_service_aidl_java",
   ]
-  min_sdk_version = 16
 }

chrome/android/webapk/shell_apk/javatests/dex_optimizer/BUILD.gn

@@ -19,7 +19,6 @@ android_apk("dex_optimizer_apk") {
   enable_multidex = false
 
   android_manifest = "AndroidManifest.xml"
-  min_sdk_version = 16
   apk_name = "DexOptimizer"
   chromium_code = false
   sources = [ "src/org/chromium/webapk/shell_apk/test/dex_optimizer/DexOptimizerServiceImpl.java" ]

chrome/browser/android/examples/custom_tabs_client/BUILD.gn

@@ -64,7 +64,6 @@ android_apk("custom_tabs_client_example_apk") {
   ]
 
   android_manifest = "src/AndroidManifest.xml"
-  min_sdk_version = 19
   target_sdk_version = 21
   apk_name = "CustomTabsClientExample"
 

chrome/browser/android/examples/custom_tabs_client/src/AndroidManifest.xml

@@ -18,10 +18,6 @@
     android:versionCode="1"
     android:versionName="1.0" >
 
-    <uses-sdk
-        android:minSdkVersion="19"
-        android:targetSdkVersion="21" />
-
     <application
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"