Revert of Expanding Type Traits to make Vector use mem ops more.

Revert of Expanding Type Traits to make Vector use mem ops more. (patchset #4 id:120001 of https://codereview.chromium.org/581683002/)

Reason for revert:
Broke developer builds on os x: https://code.google.com/p/chromium/issues/detail?id=416715

Original issue's description:
> Expanding Type Traits to make Vector use mem ops more.
> 
> Vector has several code paths depending on whether the encapsulated
> object can be handled with memmove/memcpu/memset or not, and those
> are used by many objects. Unfortunately that requires manual hinting
> in each class because the type traits used are not strong enough.
> 
> By using type trait functions available in all modern compilers it's
> possible to more intelligently select the most optimal code path.
> 
> Preferably the code would use the new type traits in C++ 11 but
> unfortunately that requires a modern c++ library. Luckily, those
> libraries are mostly just thin wrappers on top of de facto-standard
> compiler extension functions anyway.
> 
> With clang this cuts away 105 KB of machine code in blink. Mostly by 
> no longer needing copy constructor and assignment operators in many
> classes so those can be stripped from the binary. 
> 
> With gcc the changes are differently. The binary is smaller but only 
> by 5 KB. It's clear that many Vector methods have become more compact but
> it seems gcc compensated by spending that space elsewhere (more inlining?).
> 
> I don't have as good measurement tools for Visual Studio but there was no
> huge difference in footprint.
> 
> Performance, all this is from a noisy development computer with a 
> non-stable cpu clock frequency (turbo ftl...):
> 
> In LayoutTests most changes are within noise levels. But it looks like 
> large tables and flexboxes might be 1-5% faster. In ParserTests 
> html5-full-render (macro-benchmark) became 2-3% faster.
> 
> clang footprint numbers:
> Total change: -109940 bytes
> ===========================
>   14 added, totalling +3397 bytes across 8 sources
>   19 removed, totalling -13302 bytes across 6 sources
>   8 grown, for a net change of +578 bytes (2268 bytes before, 2846 bytes after) across 6 sources
>   230 shrunk, for a net change of -100613 bytes (190909 bytes before, 90296 bytes after) across 49 sources
> 
> Biggest changes:
>  -84410 - Source: /home/bratell/src/chromium/src/third_party/WebKit/Source/wtf/Vector.h - (gained 784, lost 85194)
>   -6934 - Source: /home/bratell/src/chromium/src/third_party/WebKit/Source/wtf/Deque.h - (gained 0, lost 6934)
>   -2267 - Source: /home/bratell/src/chromium/src/third_party/WebKit/Source/core/animation/css/CSSAnimationData.cpp - (gained 904, lost 3171)
> ...
>    +245 - Source: /home/bratell/src/chromium/src/third_party/WebKit/Source/core/svg/animation/SVGSMILElement.cpp - (gained 245, lost 0)
> 
> BUG=
> R=jochen@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182427

TBR=jochen@chromium.org,thakis@chomium.org,bratell@opera.com
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182459

[Nico, 2014-09-23 01:26:32]

Created Revert of Expanding Type Traits to make Vector use mem ops more.

[commit-bot: I haz the power, 2014-09-23 01:26:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/594763002/1

[commit-bot: I haz the power, 2014-09-23 01:27:15]

Committed patchset #1 (id:1) as 182459