Revert of Remove some legacy versions of StartsWith and EndsWith. (patchset #6...

Revert of Remove some legacy versions of StartsWith and EndsWith. (patchset #6 id:100001 of https://codereview.chromium.org/1239493005/)

Reason for revert:
Compilation error on Windows:

FAILED: ninja -t msvc -e environment.x86 -- C:\b\build\goma/gomacc "C:\b\depot_tools\win_toolchain\vs2013_files\VC\bin\amd64_x86\cl.exe" /nologo /showIncludes /FC @obj\chrome\installer\gcapi\gcapi_lib.gcapi.obj.rsp /c ..\..\chrome\installer\gcapi\gcapi.cc /Foobj\chrome\installer\gcapi\gcapi_lib.gcapi.obj /Fdobj\chrome\gcapi_lib.cc.pdb
c:\b\build\slave\win-latest-rel\build\src\chrome\installer\gcapi\gcapi.cc(365) : error C3083: 'StartsWith': the symbol to the left of a '::' must be a type
c:\b\build\slave\win-latest-rel\build\src\chrome\installer\gcapi\gcapi.cc(365) : error C2039: 'INSENSITIVE_ASCII' : is not a member of 'base'
c:\b\build\slave\win-latest-rel\build\src\chrome\installer\gcapi\gcapi.cc(365) : error C2065: 'INSENSITIVE_ASCII' : undeclared identifier
ninja: build stopped: subcommand failed.

Original issue's description:
> Remove some legacy versions of StartsWith and EndsWith.
>
> This just replaces
>   true -> base::CompareCase::SENSITIVE
>   false -> base::CompareCase::INSENSITIVE_ASCII
>
> I checked the insensitive cases to make sure they're not doing anything suspicious. The old version is a sometimes-correct Unicode comparison so converting to INSENSTITIVE_ASCII isn't a no-op. However, generally the prefix/suffix checking is done against a hardcoded string so there were very few cases to actually look at.
>
> extensions/browser/api/declarative_webrequest/webrequest_condition_attribute.cc has a not-quite search-and-replace change where I changed the type of a class variable.
>
> BUG=506255
> TBR=jam
>
> Committed: https://crrev.com/edce9a33027cc5f73c4866d70e34f690f6720a56
> Cr-Commit-Position: refs/heads/master@{#338996}

TBR=jam@chromium.org,brettw@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=506255

Review URL: https://codereview.chromium.org/1233453011

Cr-Original-Commit-Position: refs/heads/master@{#338998}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: ddbde8ff8310abbd529ad5cc43e3991e79106a52