Remove last remaining references to v8::Handle (all in comments/docs) in Blink.

third_party/WebKit/Source/bindings/IDLExtendedAttributes.md

 # Blink IDL Extended Attributes
 
 [TOC]
 
 ## Introduction
 
 The main interest in extended attributes are their _semantics_: Blink implements many more extended attributes than the Web IDL standard, to specify various behavior.
 
 The authoritative list of allowed extended attributes and values is [bindings/IDLExtendedAttributes.txt](https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/bindings/IDLExtendedAttributes.txt). This is complete but not necessarily precise (there may be unused extended attributes or values), since validation is run on build, but coverage isn't checked.
 
@@ skipping 793 matching lines @@
 
 ```webidl
 interface XXX {
     [Custom=PropertyGetter|PropertyQuery|PropertyEnumerator] getter Foo (DOMString name);
 };
 ```
 
 You can write custom bindings as V8XXX::namedPropertyQuery(...) and V8XXX::namedPropertyEnumerator(...) in Source/bindings/v8/custom/V8XXXCustom.cpp:
 
 ```c++
-v8::Handle<v8::Integer> V8XXX::namedPropertyQuery(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+v8::Local<v8::Integer> V8XXX::namedPropertyQuery(v8::Local<v8::String> name, const v8::AccessorInfo& info)
 {
     ...;
 }
 
-v8::Handle<v8::Array> V8XXX::namedPropertyEnumerator(const v8::AccessorInfo& info)
+v8::Local<v8::Array> V8XXX::namedPropertyEnumerator(const v8::AccessorInfo& info)
 {
     ...;
 }
 ```
 
 #### [Custom=LegacyCallAsFunction] _(i) _deprecated_
 
 Summary: `[Custom=LegacyCallAsFunction]` allows you to write custom bindings for call(...) of a given interface.
 
 Usage: `[Custom=LegacyCallAsFunction]` can be specified on interfaces:
 
 ```webidl
 [
     Custom=LegacyCallAsFunction,
 ] interface XXX {
     ...
 };
 ```
 
 If you want to write custom bindings for XXX.call(...), you can use `[Custom=LegacyCallAsFunction]`.
 
 You can write custom `V8XXX::callAsFunctionCallback(...)` in Source/bindings/v8/custom/V8XXXCustom.cpp:
 
 ```c++
-v8::Handle<v8::Value> V8XXX::callAsFunctionCallback(const v8::Arguments& args)
+v8::Local<v8::Value> V8XXX::callAsFunctionCallback(const v8::Arguments& args)
 {
     ...;
 }
 ```
 
 ### [CustomElementCallbacks] _(m, a)_
 
 Summary: Wraps the method/accessor with a Custom Elements "callback delivery scope" which will dispatch Custom Element callbacks (createdCallback, attributeChangedCallback, etc.) before returning to script.
 
 *** note
@@ skipping 549 matching lines @@
 [
     CustomConstructor(float x, float y, optional DOMString str),
 ] interface XXX {
     ...
 };
 ```
 
 Then you can write custom bindings in Source/bindings/v8/custom/V8XXXConstructorCustom.cpp:
 
 ```c++
-v8::Handle<v8::Value> V8XXX::constructorCallback(const v8::Arguments& args)
+v8::Local<v8::Value> V8XXX::constructorCallback(const v8::Arguments& args)
 {
    ...;
 }
 ```
 
 ### [FlexibleArrayBufferView]
 
 Summary: `[FlexibleArrayBufferView]` wraps a parameter that is known to be an ArrayBufferView (or a subtype of, e.g. typed arrays) with a FlexibleArrayBufferView.
 
 The FlexibleArrayBufferView itself can then either refer to an actual ArrayBufferView or a temporary copy (for small payloads) that may even live on the stack. The idea is that copying the payload on the stack and referring to the temporary copy saves creating global handles (resulting in weak roots) in V8. Note that `[FlexibleArrayBufferView]`  will actually result in a TypedFlexibleArrayBufferView wrapper for typed arrays.
@@ skipping 137 matching lines @@
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 
 THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ***
 
 [CrossOriginProperties]: https://html.spec.whatwg.org/multipage/browsers.html#crossoriginproperties-(-o-)