Revert of Update GPU memory buffers to use StrideInBytes internally.

content/common/gpu/client/gpu_memory_buffer_impl_unittest.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_unittest.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_unittest.cc b/content/common/gpu/client/gpu_memory_buffer_impl_unittest.cc
index 346b7ff5d9556b58b2e33ac1438abab68f6f35e9..3ac1b8329cad7ee1a8c61a0d5a9a296149384d95 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_unittest.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_unittest.cc
@@ -86,9 +86,9 @@
     if (configuration.usage != gfx::GpuMemoryBuffer::MAP)
       continue;
 
-    size_t width_in_bytes = 0;
-    EXPECT_TRUE(GpuMemoryBufferImpl::StrideInBytes(
-        buffer_size.width(), configuration.format, &width_in_bytes));
+    size_t width_in_bytes =
+        GpuMemoryBufferImpl::BytesPerPixel(configuration.format) *
+        buffer_size.width();
     EXPECT_GT(width_in_bytes, 0u);
     scoped_ptr<char[]> data(new char[width_in_bytes]);
     memset(data.get(), 0x2a, width_in_bytes);