Use reference links in SpecMapping.md.

TBR: scheib@chromium.org

Change-Id: I51eb3a98ad2d8c2d4b1417f8396220b9f46070c9
Reviewed-on: https://chromium-review.googlesource.com/570185Reviewed-by: Vincent Scheib <scheib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486447}

third_party/WebKit/Source/SpecMapping.md

@@ -12,37 +12,42 @@ Concepts found in the [HTML spec](https://html.spec.whatwg.org/).
 
 ### [browsing context](https://html.spec.whatwg.org/#browsing-context)
 
-A browsing context corresponds to the
-[Frame](https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/Frame.h)
-interface where the main implementation is
-[LocalFrame](https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/LocalFrame.h).
+A browsing context corresponds to the [Frame] interface where the main
+implementation is [LocalFrame].
+
+[Frame]: https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/Frame.h
+[LocalFrame]: https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/LocalFrame.h
 
 ### [origins](https://html.spec.whatwg.org/multipage/browsers.html#concept-origin)
 
-An origin corresponds to the
-[SecurityOrigin](https://cs.chromium.org/src/third_party/WebKit/Source/platform/weborigin/SecurityOrigin.h)
-class. You can test for
-[same-origin](https://html.spec.whatwg.org/multipage/browsers.html#same-origin)
-using `SecurityOrigin::canAccess` and for [same-origin
-domain](https://html.spec.whatwg.org/multipage/browsers.html#same-origin-domain)
-using `SecurityOrigin::isSameSchemeHostPort`.
+An origin corresponds to the [SecurityOrigin]. You can test for [same-origin]
+using `SecurityOrigin::canAccess` and for [same-origin domain] using
+`SecurityOrigin::isSameSchemeHostPort`.
+
+[SecurityOrigin]: https://cs.chromium.org/src/third_party/WebKit/Source/platform/weborigin/SecurityOrigin.h
+[same-origin]: https://html.spec.whatwg.org/multipage/browsers.html#same-origin
+[same-origin domain]: https://html.spec.whatwg.org/multipage/browsers.html#same-origin-domain
+
 
-The [Suborigins spec](https://w3c.github.io/webappsec-suborigins/) extends
-HTML's definition of origins. To check for same-origin corresponds to
-`SecurityOrigin::isSameSchemeHostPortAndSuborigin` while the check for same-origin
-domain already takes the suborigin into account.
+The [Suborigins spec] extends HTML's definition of origins. To check for
+same-origin corresponds to `SecurityOrigin::isSameSchemeHostPortAndSuborigin`
+while the check for same-origin domain already takes the suborigin into
+account.
+
+[Suborigins spec]: https://w3c.github.io/webappsec-suborigins/
 
 ### [Window object](https://html.spec.whatwg.org/#window)
 
-A Window object corresponds to the
-[DOMWindow](https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/DOMWindow.h)
-interface where the main implementation is
-[LocalDOMWindow](https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/LocalDOMWindow.h).
+A Window object corresponds to the [DOMWindow] interface where the main
+implementation is [LocalDOMWindow].
+
+[DOMWindow]: https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/DOMWindow.h
+[LocalDOMWindow]: https://cs.chromium.org/src/third_party/WebKit/Source/core/frame/LocalDOMWindow.h
 
 ### [WindowProxy](https://html.spec.whatwg.org/#windowproxy)
 
-The WindowProxy is part of the bindings implemented by a class of the [same
-name](https://cs.chromium.org/Source/bindings/core/v8/WindowProxy.h).
+The WindowProxy is part of the bindings implemented by the
+[WindowProxy class](https://cs.chromium.org/Source/bindings/core/v8/WindowProxy.h).
 
 ### [canvas](https://html.spec.whatwg.org/multipage/scripting.html#the-canvas-element)
 
@@ -51,19 +56,23 @@ JavaScript. Multiple
 [context types](https://html.spec.whatwg.org/multipage/scripting.html#dom-canvas-getcontext)
 are supported for different use cases.
 
-The main element's sources are in
-[HTMLCanvasElement](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/html/HTMLCanvasElement.h). Contexts
-are implemented via modules. The top-level module is
-[HTMLCanvasElementModule](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModule.h).
-
-The
-[2D canvas context](https://html.spec.whatwg.org/multipage/scripting.html#canvasrenderingcontext2d)
-is implemented in
-[modules/canvas2d](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/canvas2d/).
-
-The
-[WebGL 1.0](https://www.khronos.org/registry/webgl/specs/latest/1.0/)
-and
-[WebGL 2.0](https://www.khronos.org/registry/webgl/specs/latest/2.0/)
-contexts ([Github repo](https://github.com/KhronosGroup/WebGL)) are
-implemented in [modules/webgl](https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/webgl/).
+The main element's sources are in [HTMLCanvasElement]. Contexts are implemented
+via modules. The top-level module is [HTMLCanvasElementModule].
+
+[HTMLCanvasElement]: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/html/HTMLCanvasElement.h
+[HTMLCanvasElementModule]: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModule.h
+
+
+The [2D canvas context] is implemented in [modules/canvas2d].
+
+[2D canvas context]: https://html.spec.whatwg.org/multipage/scripting.html#canvasrenderingcontext2d
+[modules/canvas2d]: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/canvas2d/
+
+
+The [WebGL 1.0] and [WebGL 2.0] contexts ([WebGL Github repo]) are implemented
+in [modules/webgl].
+
+[WebGL 1.0]: https://www.khronos.org/registry/webgl/specs/latest/1.0/
+[WebGL 2.0]: https://www.khronos.org/registry/webgl/specs/latest/2.0/
+[WebGL Github repo]: https://github.com/KhronosGroup/WebGL
+[modules/webgl]: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/webgl/