Revert "Disable flaky AwSettingsTest#testCacheModeWithBlockedNetworkLoads"

This reverts commit b01447e6.

Reason for revert: The issue cause the test failure has been fixed.

Original change's description:
> Disable flaky AwSettingsTest#testCacheModeWithBlockedNetworkLoads
> 
> Test is flaky on Lollipop Tablet Tester
> 
> TBR=boliu@chromium.org
> 
> Bug: 1010034
> Change-Id: Ie0de96720fe2396da9032b1cc745445c06dfab61
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851707
> Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
> Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#704537}

TBR=boliu@chromium.org,perezju@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1010034
Change-Id: I295e3f92ba300297e550b9b1164fbf90ec85abb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879334Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709206}

android_webview/javatests/src/org/chromium/android_webview/test/AwSettingsTest.java

@@ -2403,7 +2403,6 @@ public class AwSettingsTest {
     @Test
     @SmallTest
     @Feature({"AndroidWebView", "Preferences"})
-    @DisabledTest(message = "crbug.com/1010034")
     // As our implementation of network loads blocking uses the same net::URLRequest settings, make
     // sure that setting cache mode doesn't accidentally enable network loads.  The reference
     // behaviour is that when network loads are blocked, setting cache mode has no effect.