Expose StoragePartition clear methods for Android WebView

android_webview/native/aw_quota_manager_bridge_impl.h

Index: android_webview/native/aw_quota_manager_bridge_impl.h
diff --git a/android_webview/native/aw_quota_manager_bridge_impl.h b/android_webview/native/aw_quota_manager_bridge_impl.h
index a7769494f7469d3d4d80442cf83340b280c77c91..8b9d60bc9332b781b71bff9955ece1f7af473fb5 100644
--- a/android_webview/native/aw_quota_manager_bridge_impl.h
+++ b/android_webview/native/aw_quota_manager_bridge_impl.h
@@ -18,6 +18,10 @@
 
 class GURL;
 
+namespace content {
+class StoragePartition;
+}
+
 namespace quota {
 class QuotaManager;
 }  // namespace quota
@@ -50,6 +54,8 @@ class AwQuotaManagerBridgeImpl : public AwQuotaManagerBridge {
                               int64 /* quota */)> QuotaUsageCallback;
 
  private:
+  content::StoragePartition* GetStoragePartition() const;
+
   quota::QuotaManager* GetQuotaManager() const;
 
   void GetOriginsCallbackImpl(