Revert of Blink roll 171141:171225

Revert of Blink roll 171141:171225 (https://codereview.chromium.org/232453002/)

Reason for revert:
Chrome for ChromeOS build is failing:
chromeos-chrome-36.0.1934.0_alpha-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/WebKit/Source/core/dom/CharacterData.cpp: In member function 'void WebCore::CharacterData::replaceData(unsigned int, unsigned int, const WTF::String&, WebCore::ExceptionState&)':
chromeos-chrome-36.0.1934.0_alpha-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/WebKit/Source/core/dom/CharacterData.cpp:146:36: error: 'realCount' may be used uninitialized in this function [-Werror=maybe-uninitialized]
chromeos-chrome-36.0.1934.0_alpha-r1:      newStr.remove(offset, realCount);
chromeos-chrome-36.0.1934.0_alpha-r1:                                     ^
chromeos-chrome-36.0.1934.0_alpha-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/WebKit/Source/core/dom/CharacterData.cpp: In member function 'void WebCore::CharacterData::deleteData(unsigned int, unsigned int, WebCore::ExceptionState&, WebCore::CharacterData::RecalcStyleBehavior)':
chromeos-chrome-36.0.1934.0_alpha-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/WebKit/Source/core/dom/CharacterData.cpp:132:36: error: 'realCount' may be used uninitialized in this function [-Werror=maybe-uninitialized]
chromeos-chrome-36.0.1934.0_alpha-r1:      newStr.remove(offset, realCount);
chromeos-chrome-36.0.1934.0_alpha-r1:                                     ^

Original issue's description:
> Blink roll 171141:171225
> 
> http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=171141:171225&mode=html
> TBR=
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=262942

TBR=eseidel@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=262950

[dzhioev (left Google), 2014-04-10 11:31:56]

Created Revert of Blink roll 171141:171225

[commit-bot: I haz the power, 2014-04-10 11:32:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dzhioev@chromium.org/233003002/1

[commit-bot: I haz the power, 2014-04-10 11:32:41]

Change committed as 262950

[yurys, 2014-04-10 11:54:54]

FYI: the problem was fixed in https://codereview.chromium.org/232243004