Revert of Enforce lowercase switches when calling CommandLine::HasSwitch(const char*).

Revert of Enforce lowercase switches when calling CommandLine::HasSwitch(const char*). (patchset #5 id:80001 of https://codereview.chromium.org/1046363002/)

Reason for revert:
This causes test fails on Android:
https://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/27294

The test uses upper case with HasSwitch():
https://code.google.com/p/chromium/codesearch#chromium/src/content/public/android/javatests/src/org/chromium/content/browser/ContentCommandLineTest.java&q=testJavaNativeTransition&sq=package:chromium&type=cs&l=96

Original issue's description:
> Enforce lowercase switches when calling CommandLine::HasSwitch.
>
> At the moment, all compile-time switches are lowercase. By enforcing
> this, we can skip converting it to lowercase on Windows, which saves
> one string allocation per call.
>
> On a profile with 2 extensions, HasSwitch is called ~12k times during
> startup. In an ideal situation (no paging/cache pressure), the
> string allocation under Windows takes ~137ns on an Xeon E5-2690 @
> 2.9Ghz. So this should shave off at least 1.6ms off a typical startup
> with this hardware. For context,
> Startup.BrowserMessageLoopStartTimeFromMainEntry is typically
> 280-300ms on the same hardware, so we should get a ~0.5% improvement.
>
> BUG=472383
>
> Committed: https://crrev.com/f58961749a980032241fe6c3fc829ac2e6652030
> Cr-Commit-Position: refs/heads/master@{#325576}

TBR=tapted@chromium.org,brettw@chromium.org,jackhou@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=472383
Committed: https://crrev.com/817cf387dbb2b63fb8c00f0f9b1535a152d88b62
Cr-Commit-Position: refs/heads/master@{#325610}

[yoichio, 2015-04-17 08:27:22]

Created Revert of Enforce lowercase switches when calling
CommandLine::HasSwitch(const char*).

[commit-bot: I haz the power, 2015-04-17 08:28:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1091993002/1

[commit-bot: I haz the power, 2015-04-17 08:28:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-17 08:29:55]

Patchset 1 (id:??) landed as
https://crrev.com/817cf387dbb2b63fb8c00f0f9b1535a152d88b62
Cr-Commit-Position: refs/heads/master@{#325610}