[wasm] Remove redundant output in decoder

The section name is printed two times currently: Once in
{WasmSectionIterator::next()}, once in
{ModuleDecoderImpl::DecodeSection}.
This is confusing when looking at the trace output, hence remove one of
the outputs.

R=ahaas@chromium.org

Change-Id: Icc699d5eb0e39325d2849ea6c345b9522985003b
Reviewed-on: https://chromium-review.googlesource.com/756703Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49175}

src/wasm/module-decoder.cc

@@ -228,7 +228,6 @@ class WasmSectionIterator {
     section_code_ = decoder_.failed() ? kUnknownSectionCode
                                       : static_cast<SectionCode>(section_code);
 
-    TRACE("Section: %s\n", SectionName(section_code_));
     if (section_code_ == kUnknownSectionCode && section_end_ > decoder_.pc()) {
       // skip to the end of the unknown section.
       uint32_t remaining = static_cast<uint32_t>(section_end_ - decoder_.pc());