[Android WebView] Update not exposed listing for navigator.share

Web Share API is currently not supported by Android WebView and
hence should not be exposed.

This patch makes sure this is the case, and will be verified
automatically by the Android WebView bots on the waterfall.

BUG=765923
NOTRY=true

Change-Id: I1c8d2f078c6b8ebe136c64cd0763645008e44b4e
Reviewed-on: https://chromium-review.googlesource.com/776716Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517803}

android_webview/tools/system_webview_shell/test/data/webexposed/not-webview-exposed.txt

@@ -39,7 +39,7 @@ interface PresentationRequest : EventTarget
 # remoteplayback api not supported in webview crbug.com/521319
 interface RemotePlayback : EventTarget
 
-# web payments api not enabled in webiew, crbug.com/667069
+# web payments api not enabled in webview, crbug.com/667069
 interface HTMLIFrameElement : HTMLElement
     getter allowPaymentRequest
     setter allowPaymentRequest
@@ -53,13 +53,15 @@ interface HTMLMediaElement : HTMLElement
     getter disableRemotePlayback       # crbug.com/521319
     getter remote                      # crbug.com/521319
 
-# permissions API (crbug.com/490120), presentation API (crbug.com/521319) and
-# custom scheme handlers (crbug.com/589502) not supported in webview 
+# permissions API (crbug.com/490120), presentation API (crbug.com/521319),
+# share API (crbug.com/765923) and custom scheme handlers (crbug.com/589502)
+# not supported in webview
 interface Navigator
     getter permissions                 # crbug.com/490120
     getter presentation                # crbug.com/521319
     method registerProtocolHandler     # crbug.com/589502
     method unregisterProtocolHandler   # crbug.com/589502
+    method share                       # crbug.com/765923
 
 # notifications not yet supported in webview, crbug.com/551446
 interface ServiceWorkerRegistration : EventTarget