Cleanup: make constant variable names in fileapi/ conform to WebKit's coding guideline

Cleanup: make constant variable names in fileapi/ conform to WebKit's coding guideline
https://bugs.webkit.org/show_bug.cgi?id=76625

Reviewed by David Levin.

Source/WebCore:

No new tests as this patch has no functional changes.

* fileapi/BlobURL.cpp:
(WebCore::BlobURL::getIdentifier):
(WebCore::BlobURL::createBlobURL):
* fileapi/BlobURL.h:
* fileapi/FileWriter.cpp:
(WebCore::FileWriter::write):
(WebCore::FileWriter::truncate):
* platform/AsyncFileSystem.cpp:
(WebCore::AsyncFileSystem::crackFileSystemURL):
(WebCore::AsyncFileSystem::toURL):
(WebCore::AsyncFileSystem::isAvailable):
* platform/AsyncFileSystem.h:

Source/WebKit/chromium:

Also removing (almost) duplicated implementation of AsyncFileSystem::crackFileSystem.

* src/AsyncFileSystemChromium.cpp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105483 268f45cc-cd09-0410-ab3c-d52691b4dbfc