Update network service content_browsertests filter after r553530.

I forgot to update the filter in that fix.

TBR=leon.han@intel.com
NOTRY=true

Bug: 729848
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I50456a8a863277c06d054a7ba9a5f5834be5057c
Reviewed-on: https://chromium-review.googlesource.com/1027993
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553535}

testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter

@@ -37,9 +37,6 @@
 -IsolatedDevToolsProtocolTest.ControlNavigationsChildFrames
 -NavigationHandleImplBrowserTest.ErrorCodeOnRedirect
 -NavigationHandleImplBrowserTest.RedirectToRendererDebugUrl
--PowerMonitorTest.TestGpuProcess
--PowerMonitorTest.TestRendererProcess
--PowerMonitorTest.TestUtilityProcess
 -RenderViewBrowserTest.ConfirmCacheInformationPlumbed
 -WebContentsImplBrowserTest.DownloadImage_Deny_FileImage