Revert of Enable noexcept on Windows, use for a few move constructors. (patchset #3 id:40001 of https://codereview.chromium.org/2771643002/ )

Reason for revert:
Seems to have broken Windows build with args.gn as:

> is_debug = true
> is_component_build = true
> enable_nacl = false
> is_chrome_branded = true
> symbol_level = 2
> target_cpu = "x86"
> is_win_fastlink = true
> is_clang = false
> win_console_app = true
> win_linker_timing = true

Original issue's description:
> Enable noexcept on Windows, use for a few move constructors.
>
> MSVC complains if you use noexcept with no exception handling mode specified (as we do).
> This code disables the warning. noexcept on move constructors allows better optimizations
> in some cases.
> http://en.cppreference.com/w/cpp/language/noexcept_spec
>
> Updates a few common classes' move constructors to use this.
>
> Review-Url: https://codereview.chromium.org/2771643002
> Cr-Commit-Position: refs/heads/master@{#458956}
> Committed: https://chromium.googlesource.com/chromium/src/+/76aac97386e2788241161420c5e7e0bfee16f88c

TBR=brucedawson@chromium.org,lfg@chromium.org,brettw@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2769703007
Cr-Original-Commit-Position: refs/heads/master@{#459101}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 12c27f45b2cd8fea6c833a47d5270da42d791740
diff --git a/tools/gn/value.cc b/tools/gn/value.cc
index 0afbc7d..b5e21f0 100644
--- a/tools/gn/value.cc
+++ b/tools/gn/value.cc
@@ -73,7 +73,7 @@
     scope_value_ = other.scope_value_->MakeClosure();
 }
 
-Value::Value(Value&& other) noexcept = default;
+Value::Value(Value&& other) = default;
 
 Value::~Value() {
 }
diff --git a/tools/gn/value.h b/tools/gn/value.h
index 3ce0117..0428818 100644
--- a/tools/gn/value.h
+++ b/tools/gn/value.h
@@ -43,7 +43,7 @@
   Value(const ParseNode* origin, std::unique_ptr<Scope> scope);
 
   Value(const Value& other);
-  Value(Value&& other) noexcept;
+  Value(Value&& other);
   ~Value();
 
   Value& operator=(const Value& other);