AW: Remove dead JNI function of AwQuotaManagerBridge

According to http://crrev/c/1742171, Java AwQuotaManagerBridge is not a
singleton and owned by Java AwBrowserContext. The JNI
GetDefaultNativeAwQuotaManagerBridge is no longer used.

Bug: None
Change-Id: I4714c9a703ccbddf62b9667dde3e4a2cde5bda74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082870Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Jinsong Fan <fanjinsong@sogou-inc.com>
Cr-Commit-Position: refs/heads/master@{#746606}

android_webview/browser/aw_quota_manager_bridge.cc

@@ -152,17 +152,6 @@ void RunOnUIThread(base::OnceClosure task) {
 
 }  // namespace
 
-// static
-jlong JNI_AwQuotaManagerBridge_GetDefaultNativeAwQuotaManagerBridge(
-    JNIEnv* env) {
-  AwBrowserContext* browser_context = AwBrowserContext::GetDefault();
-
-  AwQuotaManagerBridge* bridge = static_cast<AwQuotaManagerBridge*>(
-      browser_context->GetQuotaManagerBridge());
-  DCHECK(bridge);
-  return reinterpret_cast<intptr_t>(bridge);
-}
-
 // static
 scoped_refptr<AwQuotaManagerBridge> AwQuotaManagerBridge::Create(
     AwBrowserContext* browser_context) {