Eliminate dead code in code_generator_v8.pm (related to inheritance)

In some cases inheritance involves *parsing* parent interfaces, which is
a major cause of slowness in the IDL compiler.
This eliminates some dead code that does such parsing, simplifying the
rewrite (since we don't need to check this useless code).

Specifically it eliminates:
* BaseInterfaceName :: only one use, which is a nop
* FindSuperMethod :: no uses

No changes to generated code.

Review URL: https://codereview.chromium.org/109883002

git-svn-id: svn://svn.chromium.org/blink/trunk@163399 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: rename GetTemplate => domTemplate, rawTemplate => rawDOMTemplate

Capitalization error and style error (we omit 'get').

TBR=haraken

Review URL: https://codereview.chromium.org/101533006

git-svn-id: svn://svn.chromium.org/blink/trunk@163400 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: rename fill{{cpp_class}}Init => initialize{{cpp_class}} in Event Constructor

Rename requested by haraken@ in:
https://codereview.chromium.org/106103005/#msg2

TBR=haraken

Review URL: https://codereview.chromium.org/109953003

git-svn-id: svn://svn.chromium.org/blink/trunk@163401 bbb929c8-8fbe-4397-9dbb-9b2b20218538
IDL compiler: [InitializedByEventConstructor] (basic)

Lotta special cases for this too, to do in followups.

BUG=239771
NOTRY=true

Review URL: https://codereview.chromium.org/101533007

git-svn-id: svn://svn.chromium.org/blink/trunk@163402 bbb929c8-8fbe-4397-9dbb-9b2b20218538