Revert of Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc

Index: content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
diff --git a/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc b/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
index 8273de8d1acdc1670ebfe86181a717b953d48582..4c8f0e9a4c3caca71e5f4af68a147160fad2d8e2 100644
--- a/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
+++ b/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
@@ -24,13 +24,9 @@
         std::vector<Configuration>* configurations) {
   const Configuration supported_configurations[] = {
       {gfx::GpuMemoryBuffer::R_8, gfx::GpuMemoryBuffer::MAP},
-      {gfx::GpuMemoryBuffer::R_8, gfx::GpuMemoryBuffer::PERSISTENT_MAP},
       {gfx::GpuMemoryBuffer::RGBA_8888, gfx::GpuMemoryBuffer::MAP},
-      {gfx::GpuMemoryBuffer::RGBA_8888, gfx::GpuMemoryBuffer::PERSISTENT_MAP},
       {gfx::GpuMemoryBuffer::BGRA_8888, gfx::GpuMemoryBuffer::MAP},
-      {gfx::GpuMemoryBuffer::BGRA_8888, gfx::GpuMemoryBuffer::PERSISTENT_MAP},
-      {gfx::GpuMemoryBuffer::YUV_420, gfx::GpuMemoryBuffer::MAP},
-      {gfx::GpuMemoryBuffer::YUV_420, gfx::GpuMemoryBuffer::PERSISTENT_MAP}};
+      {gfx::GpuMemoryBuffer::YUV_420, gfx::GpuMemoryBuffer::MAP}};
   configurations->assign(
       supported_configurations,
       supported_configurations + arraysize(supported_configurations));