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 9a4bdcf538cab2132266fe8de6202c1f1e7be133..026423516c42876d86ce19c55f3e96138115fe9b 100644
--- a/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
+++ b/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
@@ -38,8 +38,8 @@ GpuMemoryBufferFactorySharedMemory::CreateGpuMemoryBuffer(
     int client_id,
     gfx::PluginWindowHandle surface_handle) {
   base::SharedMemory shared_memory;
-  if (!shared_memory.CreateAnonymous(
-          size.GetArea() * GpuMemoryBufferImpl::BytesPerPixel(format)))
+  if (!shared_memory.CreateAnonymous(GpuMemoryBufferImpl::StrideInBytes(
+          size.width(), format) * size.height()))
     return gfx::GpuMemoryBufferHandle();
 
   gfx::GpuMemoryBufferHandle handle;