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This change consolidates the storage related methods in the
WebContentSettingsClient interface into two new methods to prevent
use of repeated logic in implementations.

Implementations and usage sites have also been updated to use the new
methods, RequestStorageAccess and RequestStorageAccessSync.

Change-Id: If46b3d0ca7555b8db212b014580f0b5513bbe508
Bug: 1019415
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353552
Commit-Queue: Shubham Aggarwal <shuagga@microsoft.com>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805360}