Revert of Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/browser/gpu/browser_gpu_memory_buffer_manager.cc

Index: content/browser/gpu/browser_gpu_memory_buffer_manager.cc
diff --git a/content/browser/gpu/browser_gpu_memory_buffer_manager.cc b/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
index 2db48f15e027e76a46d8921c8512252461bd9623..70184a0f48aeb2218554e36f37314ed2ba6854ac 100644
--- a/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
+++ b/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
@@ -99,9 +99,8 @@
   // by factory.
   if (!gpu_memory_buffer_factory_host_->IsGpuMemoryBufferConfigurationSupported(
           format, usage)) {
-    DCHECK(GpuMemoryBufferImplSharedMemory::IsFormatSupported(format))
-        << format;
-    DCHECK(GpuMemoryBufferImplSharedMemory::IsUsageSupported(usage)) << usage;
+    DCHECK(GpuMemoryBufferImplSharedMemory::IsFormatSupported(format));
+    DCHECK_EQ(usage, gfx::GpuMemoryBuffer::MAP);
     return GpuMemoryBufferImplSharedMemory::Create(
         g_next_gpu_memory_buffer_id.GetNext(), size, format);
   }
@@ -143,8 +142,8 @@
           format, usage)) {
     // Early out if we cannot fallback to shared memory buffer.
     if (!GpuMemoryBufferImplSharedMemory::IsFormatSupported(format) ||
-        !GpuMemoryBufferImplSharedMemory::IsUsageSupported(usage) ||
-        !GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(size, format)) {
+        !GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(size, format) ||
+        usage != gfx::GpuMemoryBuffer::MAP) {
       callback.Run(gfx::GpuMemoryBufferHandle());
       return;
     }