Revert of Update GPU memory buffers to use StrideInBytes internally.

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 b10fd00dfbc98f756bbb68ba087dd49dc8d1f0fa..9a4bdcf538cab2132266fe8de6202c1f1e7be133 100644
--- a/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
+++ b/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
@@ -38,18 +38,8 @@
     int client_id,
     gfx::PluginWindowHandle surface_handle) {
   base::SharedMemory shared_memory;
-
-  size_t stride_in_bytes = 0;
-  if (!GpuMemoryBufferImpl::StrideInBytes(
-          size.width(), format, &stride_in_bytes))
-    return gfx::GpuMemoryBufferHandle();
-
-  base::CheckedNumeric<size_t> size_in_bytes = stride_in_bytes;
-  size_in_bytes *= size.height();
-  if (!size_in_bytes.IsValid())
-    return gfx::GpuMemoryBufferHandle();
-
-  if (!shared_memory.CreateAnonymous(size_in_bytes.ValueOrDie()))
+  if (!shared_memory.CreateAnonymous(
+          size.GetArea() * GpuMemoryBufferImpl::BytesPerPixel(format)))
     return gfx::GpuMemoryBufferHandle();
 
   gfx::GpuMemoryBufferHandle handle;