Remove stale context_lost expectations

Removes expectations for the context_lost suite that have been
determined to be stale. This only touches expectations that have passed
100% of the time on all builders.

Bug: 603329, 965268, 1034008, 1155766
Change-Id: I18cbf44cff542eabf5fc40a4f716af2f04f6a1ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591969Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837863}

content/test/gpu/gpu_tests/test_expectations/context_lost_expectations.txt

@@ -57,15 +57,11 @@
 # END TAG HEADER
 
 # Win7 bots
-crbug.com/603329 [ win7 ] ContextLost_WebGLContextLostFromGPUProcessExit [ RetryOnFailure ]
 crbug.com/1127541 [ win7 ] ContextLost_WebGPUContextLostFromGPUProcessExit [ Skip ]
 
 # Win8 Release and Debug NVIDIA bots.
 crbug.com/524808 [ win8 nvidia ] ContextLost_WebGLContextLostFromSelectElement [ Skip ]
 
-# Win10 NVIDIA
-crbug.com/965268 [ win10 nvidia ] ContextLost_WebGLBlockedAfterJSNavigation [ RetryOnFailure ]
-
 # Flakily timing out on Win x64 Debug bot. Unfortunately we can't identify this
 # separately from the 32-bit bots. Also unfortunately, the flaky retry mechanism
 # doesn't work well in this harness if the test times out. Skip it on this
@@ -109,9 +105,6 @@ crbug.com/609629 [ android android-nexus-9 ] ContextLost_WebGLContextLostFromGPU
 crbug.com/681341 [ mac nvidia ] ContextLost_MacWebGLMultisamplingHighPowerSwitchLosesContext [ Skip ]
 crbug.com/681341 [ mac nvidia ] ContextLost_MacWebGLPreserveDBHighPowerSwitchLosesContext [ Skip ]
 
-# Linux Intel Flake
-crbug.com/1034008 [ linux intel ] ContextLost_WebGLContextLostInHiddenTab [ RetryOnFailure ]
-
 # These tests use base::Process::TerminateCurrentProcessImmediately(0) on the
 # GPU process and expect a normal exit code reported to the browser process.
 # On Android, this returns a process killed exit code.