base: Remove the string logging from CHECK().

blimp/engine/mojo/blob_channel_service.cc

Index: blimp/engine/mojo/blob_channel_service.cc
diff --git a/blimp/engine/mojo/blob_channel_service.cc b/blimp/engine/mojo/blob_channel_service.cc
index a603b12271349eb7b280c3802bdf5c95649a05aa..05df743f7472d0f743a84cf3aaae2c0d0ed630df 100644
--- a/blimp/engine/mojo/blob_channel_service.cc
+++ b/blimp/engine/mojo/blob_channel_service.cc
@@ -85,7 +85,8 @@ void BlobChannelService::PutBlob(const std::string& id,
   }
 
   mojo::ScopedSharedBufferMapping mapping = data->Map(size);
-  CHECK(mapping) << "Failed to mmap region of " << size << " bytes.";
+  // Failed to mmap region of |size| bytes.
+  CHECK(mapping);
 
   scoped_refptr<BlobData> new_blob(new BlobData);
   new_blob->data.assign(reinterpret_cast<const char*>(mapping.get()), size);