Remove LOG(FATAL) in vulkan_swap_chain.cc

With NVidia GPU, the Xserver crashing and vkCreateSwapchainKHR()
returning errors happen at same time. Not sure if Xserver crashes cause
the vkCreateSwapchainKHR() call fail, or Chrome crashes after
vkCreateSwapchainKHR() returning errors cause Xserver crash. So with
this change, Chrome GPU process will not crash when
vkCreateSwapchainKHR() return errors. Instead chrome GPU process will
handle the error, and consider it as context lost, and then try to tear
down everything, and then restart the GPU process.

Bug: 1149673
Change-Id: I9f5e5ca5aaf3f17107e1f9de31fa7837e6489d23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587073
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836137}

gpu/vulkan/vulkan_swap_chain.cc

@@ -225,7 +225,7 @@ bool VulkanSwapChain::InitializeSwapChain(
   }
 
   if (UNLIKELY(VK_SUCCESS != result)) {
-    LOG(FATAL) << "vkCreateSwapchainKHR() failed: " << result;
+    LOG(DFATAL) << "vkCreateSwapchainKHR() failed: " << result;
     return false;
   }