WebView: add {set,get}SafeBrowsingEnabled per WebView

android_webview/apk/java/proguard.flags

 # Don't rename anything, it makes stack traces unintelligible. We only allow the
 # obfuscation pass to run so that we can discard attributes like local variable
 # tables. However, we don't want to lose out on optimizations, so although they
 # can occasionally make the stack trace a bit stranger with inlining, it won't
 # make a big difference for the users seeing the stacktraces. We can always use
 # build/android/stacktrace/java_deobfuscate.py to fix the stacktrace up for us.
 -keepnames,allowoptimization class *** { *; }
 
 -keepclassmembers class org.chromium.android_webview.AwPdfExporter {
     android.view.ViewGroup mContainerView;
 }
 
 # Keep the factory and its public members; it's the main entry point used by the
 # framework.
 -keep class com.android.webview.chromium.WebViewChromiumFactoryProvider {
     public *;
 }
 
+# TODO(ntfschr): remove this once Android O is released (crbug/706631)

[sgurun-gerrit only, 2017/04/11 00:38:52]

I don't think you need to remove it. Just like the ones below, we can leave it.

[Nate Fischer, 2017/04/11 00:58:02]

Done

+-keep class com.android.webview.chromium.ContentSettingsAdapter {
+    public *;
+}
+
 -keep class com.android.webview.chromium.WebViewChromiumFactoryProviderFor* {
     public *;
 }
 
 -keep class com.android.webview.chromium.WebViewDatabaseAdapter {
   public *;
 }
 
 # This is the main entry point for APIs. It is kept to make developing with
 # unreleased Android easier.
@@ skipping 36 matching lines @@
   PlatformServiceBridgeGoogle(...);
 }
 -dontnote com.android.webview.chromium.PlatformServiceBridgeGoogle
 -keep class com.android.webview.chromium.AwSafeBrowsingApiHandler {
   AwSafeBrowsingApiHandler(...);
 }
 -dontnote com.android.webview.chromium.AwSafeBrowsingApiHandler
 
 # We strip some unused resources when preprocessing the GMS client libs.
 -dontwarn com.google.android.gms.R**