[Android WebView] remove the entry-point for the support library.

WebView 66 is not compatible with the WebView Support Library. To ensure
we fail to use WebView 66 together with the Support Library in a
reasonable/expected way, we remove the entry-point
(SupportLibReflectionUtil) the support library uses to call into the
WebView code. By doing so we make sure the support library treats
WebView 66 just like any of the previously released WebView APKs.

Bug: 818160
Change-Id: I5ad1f904f83a8299f03d05bb8295fc8406ee0425
Reviewed-on: https://chromium-review.googlesource.com/953004
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/branch-heads/3359@{#92}
Cr-Branched-From: 66afc5e-refs/heads/master@{#540276}

android_webview/support_library/BUILD.gn

@@ -7,7 +7,6 @@ import("//build/config/android/rules.gni")
 
 android_library("support_lib_glue_java") {
   java_files = [
-    "java/src/org/chromium/support_lib_glue/SupportLibReflectionUtil.java",
     "java/src/org/chromium/support_lib_glue/SupportLibWebSettingsAdapter.java",
     "java/src/org/chromium/support_lib_glue/SupportLibWebViewChromium.java",
     "java/src/org/chromium/support_lib_glue/SupportLibWebViewChromiumFactory.java",