Revert "[Sheriff] Disable many PolicyDeviceDisplayResolution tests."

This reverts commit 7f37ccd8.

Reason for revert: I have menually tested the previously failing tests
on linux-chromeos-os builders. Tests no longer fail, enabling them back.

Original change's description:
> [Sheriff] Disable many PolicyDeviceDisplayResolution tests.
>
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionRecommendedTest.Internal/0
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionRecommendedTest.Internal/1
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionRecommendedTest.Internal/2
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionRecommendedTest.ResizeExternalDisplay/0
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionRecommendedTest.ResizeExternalDisplay/1
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionRecommendedTest.ResizeExternalDisplay/2
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.ConnectExternalDisplay/0
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.Internal/0
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.Internal/2
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.ResizeExternalDisplay/0
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.ResizeExternalDisplay/1
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.ResizeExternalDisplay/2
> PolicyDeviceDisplayResolution/DeviceDisplayResolutionTest.SetAndUnsetPolicy/0
> PolicyDeviceDisplayResolution/DisplayResolutionBootTest.Reboot/0
>
> TBR=antrim@chromium.org
>
> Bug: 1000694
> Change-Id: I58373a317fc917f79ff440ec14c62dc9d84cda6b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800409
> Reviewed-by: vitaliii <vitaliii@chromium.org>
> Commit-Queue: vitaliii <vitaliii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#696000}

TBR=antrim@chromium.org,vitaliii@chromium.org

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

Bug: 1000694
Change-Id: I179ddcf31fe0ac425ce6f5d8c99d2ed35420d962
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1813345Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698854}

chrome/browser/chromeos/policy/display_resolution_handler_browsertest.cc

@@ -283,8 +283,7 @@ class DeviceDisplayResolutionTest : public DeviceDisplayResolutionTestBase {
   DISALLOW_COPY_AND_ASSIGN(DeviceDisplayResolutionTest);
 };
 
-// crbug.com/1000694.
-IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest, DISABLED_Internal) {
+IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest, Internal) {
   const PolicyValue policy_value = GetParam();
 
   EXPECT_EQ(kDefaultDisplayScale, GetScaleOfInternalDisplay())
@@ -301,9 +300,7 @@ IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest, DISABLED_Internal) {
       << "Scale of primary display after policy";
 }
 
-// crbug.com/1000694.
-IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest,
-                       DISABLED_ResizeExternalDisplay) {
+IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest, ResizeExternalDisplay) {
   const PolicyValue policy_value = GetParam();
 
   AddExternalDisplay();
@@ -331,9 +328,7 @@ IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest,
       << "Primary display scale after resizing external";
 }
 
-// crbug.com/1000694.
-IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest,
-                       DISABLED_ConnectExternalDisplay) {
+IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest, ConnectExternalDisplay) {
   const PolicyValue policy_value = GetParam();
 
   SetPolicy(policy_value);
@@ -353,9 +348,7 @@ IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest,
       << "Primary display scale after connecting external";
 }
 
-// crbug.com/1000694.
-IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest,
-                       DISABLED_SetAndUnsetPolicy) {
+IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionTest, SetAndUnsetPolicy) {
   const PolicyValue policy_value = GetParam();
   AddExternalDisplay();
   SetPolicy(policy_value);
@@ -448,8 +441,7 @@ IN_PROC_BROWSER_TEST_P(DisplayResolutionBootTest, PRE_Reboot) {
       << "Initial primary display scale after policy set";
 }
 
-// crbug.com/1000694.
-IN_PROC_BROWSER_TEST_P(DisplayResolutionBootTest, DISABLED_Reboot) {
+IN_PROC_BROWSER_TEST_P(DisplayResolutionBootTest, Reboot) {
   const PolicyValue policy_value = GetParam();
 
   AddExternalDisplay();
@@ -502,9 +494,7 @@ class DeviceDisplayResolutionRecommendedTest
   DISALLOW_COPY_AND_ASSIGN(DeviceDisplayResolutionRecommendedTest);
 };
 
-// crbug.com/1000694.
-IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionRecommendedTest,
-                       DISABLED_Internal) {
+IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionRecommendedTest, Internal) {
   const PolicyValue policy_value = GetParam();
   EXPECT_EQ(kDefaultDisplayResolution, GetResolutionOfInternalDisplay())
       << "Initial primary display resolution before policy";
@@ -528,9 +518,8 @@ IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionRecommendedTest,
       << "Scale of internal display after user operation";
 }
 
-// crbug.com/1000694.
 IN_PROC_BROWSER_TEST_P(DeviceDisplayResolutionRecommendedTest,
-                       DISABLED_ResizeExternalDisplay) {
+                       ResizeExternalDisplay) {
   const PolicyValue policy_value = GetParam();
   AddExternalDisplay();